the new report from the united nations warns countries must drastically reduce their carbon emissions in the next decade or ensure irreversible environmental damage. the climate change emissions gap report shows that global emissions must decline by 7.6% a year between 2020 and 2030, even if every country meets that standard, the report reveals that average temperatures are still on track to rise a dangerous 3.2 degrees celsius. that would increase the likelihood of worldwide climate catastrophe. cal perry went to california for the last word and learned how climate change is causing that state's fires to grow and why n intentional black out to prevent them may become the new normal. >> reporter: 81-year-old dr. glenn benjamin appears to be in constant conflict with california's most historic fires. two years ago.

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