越是大膽的改變反對聲浪越大,先進國,發展中國家強烈反彈: A 350 ppm cap on atmospheric concentrations would unreasonably constrain their economies.
Tuvalu的350ppt CO2濃度代表什麽?是氣候科學家相信的安全水平,唯一的問題是,我們目前的排放量已經達390ppm。我們早已cross the line,等待著許多未知的災難(maybe)。
UK Met Office在最新的減碳報告中指出, “If you reduced everything to zero immediately you'd still get about 1.3C because of the greenhouse gases already in the atmosphere.
Policies to ensure a reasonable chance of remaining under 1.5C would involve "negative emissions" - sucking CO2 out of the air. ”
至於原本的450ppm與2度升溫的臨界時間點本來就夠低了, CO2 emission peaking in 2018 and shrinking emissions by 4% per year after that would give a 50% chance of keeping warming below 2C。
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