Global Warming

Global warming is the increase in the temperature of the earth's surface due to the emission of greenhouse gases from human activity. I do believe in global warming because glaciers are melting, sea levels are rising, cloud forests are drying, and all in all, the temperatures are much higher than they have been in the past. Three pieces of evidence that say global warming is not happening is that Antarctica is getting colder, not warmer, polar bear numbers are increasing, oceans are cooling, and Mars and Pluto are warming too.