Simplify the following text for a Grade 13 native English-speaking person.
Original: A main activity of the IPCC is publishing special reports on topics relevant to the implementation of the UN Framework Convention on Climate Change ( UNFCCC ) , an international treaty that acknowledges the possibility of harmful climate change .
Simplified: A lot of IPCC work is publishing reports about the UN Framework Convention on Climate Change ( UNFCCC ) , an international agreement that human inventions and chemistry may make the Earth too warm to live on .