The destruction of forests and jungles. - Deforestation, A species of animal or plant that is seriously at risk of extinction. - Endangered species, Economical use of electricity, gas, or other forms of energy. - Energy saving, Natural fuel such as coal or gas. - Fossil fuels, Long-term warming of the planet's overall temperature. - Global warming, A variation in world weather patterns. - Climate change, Converting waste into new material. - Recycling, Prevention of wasteful use of a resource. - Conservation, Types of air which make the world hotter. - Greenhouse gasses/gases, The ability to maintain or support a process continuously over time. - Sustainability, Radiant energy emitted by the sun. - Solar energy, Rubbish which is buried underground. - Landfill waste, Power obtained by harnessing the energy of the wind. - Wind power, The deterioration of the earth's land surfaces - Land pollution (contamination), Buses, trains, subway, metro. - Public transportation/transport, Transplanting tree seedlings, generally for forestry. - Tree planting,

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