Global warming is caused by greenhouse gases like carbon dioxide and methane that trap heat in the atmosphere. Some effects of global warming include hotter temperatures, melting ice caps and glaciers, rising sea levels, and more extreme weather. While developed nations contribute most to global warming, everyone needs to take steps to reduce their impact by using less energy, consuming less meat and paper products, and promoting environmental protection. Planting trees and changing lifestyle habits can help mitigate the effects of climate change.