Climate change, desertification and deforestation in Mexico. The document discusses how climate change is altering the climate significantly due to factors like latitude, altitude, winds, and more. It then discusses how human influence on climate can be both systematic and part of the biosphere. Deforestation and desertification are also covered, with deforestation decreasing water supply and climate balance, while desertification can be caused by overfarming and results in loss of vegetation and soil erosion. Desertification affects a quarter of the planet and many poor regions. The main causes are overfarming, overgrazing, deforestation, and lack of irrigation.