Global warming - A gradual & long-term warming of the planet's overall temperature, Greenhouse effect - A process that occurs when gases in Earth's atmosphere trap the Sun's heat, Forest fires / Bush fires - Any uncontrolled and non-prescribed combustion or burning of plants in a natural setting such as a forest, grassland, brush land or tundra, Deforestation - The clearing or thinning of forests by humans to make rooms for something beside forest, such as agricultural cropland or urbanization , Ozone depletion - The thinning of the ozone layer present in the upper atmosphere, Acid rain - Any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms, Land degradation - The deterioration or loss of the productive capacity of the soils for present and future because of human exploitation or natural cause, Environment - The surroundings or conditions in which a person lives in. , atmosphere - The envelope of gases surrounding the Earth., Biome - A large natural occurring community of climate. , pollution - A substance that has a harmful or poisonous effect , ecosystem - A biological community of interacting organisms and their physical environment., ice cap - a covering of ice over a large area , renewable energy - sources of plentiful energy , nonrenewable energy - sources take million years to form, air pollution - the presence in or introduction into the air of a substance which has harmful or poisonous effects., noise pollution - harmful or annoying levels of noise,

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