{"id":53034,"date":"2021-05-26T06:17:14","date_gmt":"2021-05-26T06:17:14","guid":{"rendered":"https:\/\/ingeoexpert.com\/pt\/?p=53034"},"modified":"2021-05-26T06:18:28","modified_gmt":"2021-05-26T06:18:28","slug":"causas-das-alteracoes-climaticas","status":"publish","type":"post","link":"https:\/\/ingeoexpert.com\/pt\/blog\/2021\/05\/26\/causas-das-alteracoes-climaticas\/","title":{"rendered":"Causas das altera\u00e7\u00f5es clim\u00e1ticas"},"content":{"rendered":"<p><em>Quando se fala em <strong>altera\u00e7\u00f5es clim\u00e1ticas<\/strong>, muitas vezes referido como \u201caquecimento global\u201d ainda que n\u00e3o seja exatamente o mesmo, falamos de uma varia\u00e7\u00e3o importante e cont\u00ednua no tempo dos <strong>padr\u00f5es clim\u00e1ticos<\/strong> durante per\u00edodos de tempo extensos (desde d\u00e9cadas a milh\u00f5es de anos). Estas mudan\u00e7as n\u00e3o se d\u00e3o por um \u00fanico motivo concreto, sendo provocadas por diversos fatores.<\/em><em>\u00a0<\/em><\/p>\n<p>J\u00e1 quando falamos de <strong>aquecimento global<\/strong>, estamos a referir-nos ao aumento cont\u00ednuo da temperatura m\u00e9dia do clima da Terra. Mas, <strong>sabe quais s\u00e3o as causas das altera\u00e7\u00f5es clim\u00e1ticas<\/strong>? Vamos contar-lhe um pouco mais sobre o que est\u00e1 a provocar e a acelerar uma mudan\u00e7a na meteorologia e ecossistemas a n\u00edvel global.<\/p>\n<h2><strong>Quais s\u00e3o as causas das altera\u00e7\u00f5es clim\u00e1ticas?<\/strong><\/h2>\n<p>Para responder a esta pergunta, o primeiro que deve saber \u00e9 que as temperaturas na Terra s\u00e3o aptas para a vida devido ao que conhecemos como \u201cefeito estufa\u201d. O efeito estufa ocorre quando uma radia\u00e7\u00e3o solar chega \u00e0 atmosfera terrestre: uma parte dela \u201csalta\u201d na atmosfera e a outra parte chega \u00e0 Terra, fazendo com que esta se aque\u00e7a. Quando o calor \u00e9 irradiado para o exterior, \u00e9 absorvido por gases de efeito estufa, conseguindo uma temperatura m\u00e9dia de 15 graus cent\u00edgrados. Se isto n\u00e3o ocorresse, a Terra teria uma temperatura m\u00e9dia de -19 graus.<\/p>\n<p style=\"text-align: center;\">Relacionado:\u00a0<a href=\"https:\/\/ingeoexpert.com\/pt\/cursos-online\/meio-ambiente\/\" target=\"_blank\" rel=\"noopener\">Cursos de Meio ambiente<\/a>.<\/p>\n<p>No entanto, o aumento da quantidade de gases de efeito estufa, faz com que o calor que se mant\u00e9m na Terra seja maior, afetado, por esse motivo, a temperatura m\u00e9dia global, que se repercute de distintas formas: como a desertifica\u00e7\u00e3o de zonas \u00e1ridas ou o derretimento do gelo nos polos.<\/p>\n<p>Mas, porque motivo est\u00e3o a aumentar a quantidade de gases de efeito estufa? Sobretudo pela a\u00e7\u00e3o humana, que aumenta a quantidade de <strong>combust\u00e3o de combust\u00edveis f\u00f3sseis<\/strong> (carv\u00e3o, por exemplo), por parte dos autom\u00f3veis, ind\u00fastrias ( de carne, ou qualquer outra) e para a produ\u00e7\u00e3o de eletricidade. Todas estas atividades libertam gases de efeito estufa.<\/p>\n<p>Podemos enumerar alguns destes gases:<\/p>\n<ul>\n<li>CO2 ou di\u00f3xido de carbono (combust\u00edveis f\u00f3sseis, carros, f\u00e1bricas\u2026).<\/li>\n<li>Metano (aterros sanit\u00e1rios, agricultura, excrementos de gado).<\/li>\n<li>\u00d3xido nitroso (fertilizantes e refrigerantes).<\/li>\n<\/ul>\n<p>A combina\u00e7\u00e3o de excesso destes gases com a desfloresta\u00e7\u00e3o, que reduz o n\u00famero de \u00e1rvores (recorde-se que as massas de \u00e1rvores como, florestas, bosques e selvas absorvem, C02) potencia o aumento de altera\u00e7\u00f5es clim\u00e1ticas.<\/p>\n<h2><strong>Causas do aquecimento global<\/strong><\/h2>\n<p>O aquecimento global \u00e9 o aumento da temperatura em todo o mundo, assim como na atmosfera e oceanos, produzido por agentes externos que est\u00e3o cada vez mais presentes nas nossas vidas. Os principais agentes que causam o aquecimento global s\u00e3o os gases de efeito estufa e embora se fale muito do impacto do C02 ou do di\u00f3xido de carbono na atmosfera, o certo \u00e9 que a mol\u00e9cula de metano produz 20 vezes mais concentra\u00e7\u00e3o de calor que uma de C02. No caso de uma mol\u00e9cula de \u00f3xido de nitroso a cifra ascende at\u00e9 300 vezes comparado com o calor que produz uma de di\u00f3xido de carbono. Contudo, a fama deste g\u00e1s como uma das maiores <strong>causas do aquecimento global<\/strong> n\u00e3o \u00e9 falsa, visto que as concentra\u00e7\u00f5es dos outros gases s\u00e3o menores no nosso planeta, n\u00e3o existindo nenhum outro g\u00e1s que produza um aumento de temperatura na atmosfera compar\u00e1vel \u00e0 do di\u00f3xido de carbono.<\/p>\n<h2><strong>Causas das altera\u00e7\u00f5es clim\u00e1ticas<\/strong><\/h2>\n<p>Os gases de efeito estufa s\u00e3o as principais causas das altera\u00e7\u00f5es clim\u00e1ticas na Terra, mas h\u00e1 outras causas n\u00e3o relacionadas com eles, nem com a a\u00e7\u00e3o humana. Tais como:<\/p>\n<ul>\n<li><strong>A inclina\u00e7\u00e3o da Terra<\/strong>. O nosso planeta tem 23,5\u00ba de inclina\u00e7\u00e3o dentro do plano perpendicular da sua trajet\u00f3ria ao redor do sol, mas este eixo move-se um pouco mais de meio grau a cada cem anos, o que tamb\u00e9m causa altera\u00e7\u00f5es clim\u00e1ticas de aumento de temperaturas.<\/li>\n<li><strong>As correntes oce\u00e2nicas<\/strong>. Mais de dois ter\u00e7os da superf\u00edcie total da Terra est\u00e3o ocupados por massas de \u00e1gua, cujo uma das suas fun\u00e7\u00f5es \u00e9 absorver uma grande parte da radia\u00e7\u00e3o solar. As correntes oce\u00e2nicas podem alterar este equil\u00edbrio como sucede especialmente no Oceano Pacifico, com a passagem da corrente Humboldt, causando assim altera\u00e7\u00f5es clim\u00e1ticas.<\/li>\n<\/ul>\n<h2><strong>Consequ\u00eancias das altera\u00e7\u00f5es clim\u00e1ticas<\/strong><\/h2>\n<p>Uma vez explicadas as causas das altera\u00e7\u00f5es clim\u00e1ticas, podemos agora conhecer os seus efeitos. Alguns deles, tais como a prolifera\u00e7\u00e3o de furac\u00f5es, j\u00e1 se mostram evidentes.<\/p>\n<ul>\n<li>O n\u00edvel do mar ir\u00e1 subir, afetando cidades costeiras e milhares de pessoas. Esta subida est\u00e1 tamb\u00e9m relacionada com o derretimento dos glaciares de gelo dos p\u00f3los.<\/li>\n<li>Zonas habitualmente de muita chuva ou neve ir\u00e3o perder esta caracter\u00edstica.<\/li>\n<li>Muitos lagos e rios v\u00e3o secar.<\/li>\n<li>Haver\u00e1 menos \u00e1gua dispon\u00edvel para a agricultura, \u00a0produ\u00e7\u00e3o de comida e para consumo humano.<\/li>\n<li>Zonas \u00e1ridas v\u00e3o sofrer de desertifica\u00e7\u00e3o.<\/li>\n<li>A flora e a fauna ser\u00e3o afetadas e muitas esp\u00e9cies ficar\u00e3o extintas.<\/li>\n<li>Migra\u00e7\u00f5es massivas de pessoas que vivem nas zonas mais afetadas pelas altera\u00e7\u00f5es clim\u00e1ticas.<\/li>\n<li>Furac\u00f5es, tornados, inunda\u00e7\u00f5es, tempestades e outros desastres naturais produzidos por mudan\u00e7as de temperaturas e evapora\u00e7\u00e3o de \u00e1gua ser\u00e3o mais comuns. Uma realidade, que j\u00e1 vimos nos \u00faltimos anos, com grandes furac\u00f5es no Caribe\u00a0e em zonas europeias (Galiza, Irlanda,etc.).<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Fonte:\u00a0<a href=\"https:\/\/ec.europa.eu\/clima\/citizens\/eu_es\">Comiss\u00e3o Europeia<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quando se fala em altera\u00e7\u00f5es clim\u00e1ticas, muitas vezes referido como \u201caquecimento global\u201d ainda que n\u00e3o seja exatamente o mesmo, falamos de uma varia\u00e7\u00e3o importante e cont\u00ednua no tempo dos padr\u00f5es clim\u00e1ticos durante per\u00edodos de tempo extensos (desde d\u00e9cadas a milh\u00f5es de anos). Estas mudan\u00e7as n\u00e3o se d\u00e3o por um \u00fanico motivo concreto, sendo provocadas por [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":53035,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[1144],"tags":[],"class_list":["post-53034","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-meio-ambente","entry","has-media","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Causas das altera\u00e7\u00f5es clim\u00e1ticas - Ingeoexpert PT<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ingeoexpert.com\/pt\/blog\/2021\/05\/26\/causas-das-alteracoes-climaticas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Causas das altera\u00e7\u00f5es clim\u00e1ticas - Ingeoexpert PT\" \/>\n<meta property=\"og:description\" content=\"Quando se fala em altera\u00e7\u00f5es clim\u00e1ticas, muitas vezes referido como \u201caquecimento global\u201d ainda que n\u00e3o seja exatamente o mesmo, falamos de uma varia\u00e7\u00e3o importante e cont\u00ednua no tempo dos padr\u00f5es clim\u00e1ticos durante per\u00edodos de tempo extensos (desde d\u00e9cadas a milh\u00f5es de anos). 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