перевод пж, только не гугловский, а нормальный
Human activity is changing the amount of greenhouse gases in the atmosphere. As cities have grown in size and population, people have needed more and more electricity, cars and products of all kinds. As industries have grown, more greenhouse gases have been produced by the burning of fossil fuels such as oil, coal and natural gas. The increases in these gases make greenhouse 'glass' thicker, causing more heat to be held in the atmosphere than in the past. It doesn't seem like much, but a slight warming could cause changes in the climate of many regions. If the climate changed enough, the plants and animals that normally live there could no longer survive.