The document discusses the mechanisms and effects of global warming. It explains that greenhouse gases in the atmosphere reflect heat from the sun back towards the Earth's surface, causing temperatures to rise. Some of the effects mentioned include rising sea levels, melting glaciers, more extreme weather events like floods and droughts, as well as impacts on plants, animals and human communities. The document also provides current examples, noting that between 1900-2000 sea levels rose 10-20cm, glaciers are retreating in mountain ranges, and severe forest fires occurred in 2003 in Russia, America and Portugal due to heat and drought. Plans to address global warming focus on developing renewable energy, promoting energy efficiency, and increasing carbon absorption through activities like tree planting.