greenhouse gas emissions from fossil fuel burning and deforestation are choking the planet, and putting billions of people at immediate risk. it's the most comprehensive climate change study ever, and is produced by hundreds of the world's top scientists from 66 countries. the report warns that the global average temperature rise could reach or exceed 1.5 celsius in the next 20 years — ten years sooner than expected. it said rising temperatures will cause more frequent, extreme weather events across the globe, and warned that irreversible changes are already ongoing in melting ice sheets, rising sea levels, and increasing acidification. but the report also stated that climate change could be slowed down — with rapid and sustained emission reductions. our science editor david shukman has this report. as the world gets hotter, it's becoming more threatening.
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