UN: Could you write us a report on global warming of 1.5C?
IPCC: It will take years of volunteer effort from scientists.
UN: We understand. It's important.
IPCC (3 years later): Here's your report.
UN: Er, right, about that report. https://t.co/5h5kn3M8MZ

— Simon Donner (@simondonner) December 9, 2018