气候变化影响，澳大利亚热带雨林“吸碳”变“排碳”

Core Viewpoint - A recent study published in the British journal Nature indicates that extreme weather events due to climate change have significantly increased tree mortality rates in the tropical rainforests of Queensland, Australia, transforming these carbon-absorbing forests into carbon emission sources [1][3]. Group 1: Research Findings - The study, initiated by multiple academic institutions from Australia, the UK, and France, tracked the growth of tropical rainforests in Queensland since the 1970s [3]. - From 1970 to 1980, the average annual net carbon absorption per hectare of rainforest was approximately one ton [3]. - However, between 2010 and 2019, the situation reversed, with rainforests releasing nearly the same amount of carbon per hectare annually [3]. Group 2: Climate Change Impact - The research highlights that the effects of climate change extend beyond increased temperatures and droughts to include more frequent cyclonic activity, which severely damages the rainforest ecosystem [5]. - The carbon absorbed during tree growth can no longer offset the carbon released due to large-scale tree mortality [5]. - Researchers express concern that more rainforests may face similar challenges in the future and urge immediate action to reduce greenhouse gas emissions to preserve these vital forests' role in mitigating global warming [5].