1. What are Earth's natural climate cycles? They are a result the "wobble" of the earth, the tilt of the Earth and the the Earth's orbital
path around the sun.
© Volcanoes put the CO2 out and trees take it all back in.
People are burning too many fossil fuels, changing the surface temperature of the Earth.
Humans have been putting too much CO2 in the Earth's atmosphere, over the last 150
years, which is causing the planet to warm.