Natural phenomena such as melting glaciers is due to the rise in temperature. This will result to extinction of flora and fauna. Moreover it can cause extreme flooding due to rise in water level in other water bodies such as rivers, lakes
Volcanic activity actually caused More global warming than we have today by releasing a ton of greenhouse gases from the ground to the atmosphere. Ice age when the earths tilt and orbit was in such a way that minimal solar radiation made it to the northern hemisphere
