Greenhouse gases

The proportion of greenhouse gases has increased significantly since the Industrial Revolution. Humans began burning fossil fuels, particularly coal , in a big way, to drive steam engines for industry, and generate electricity. In addition to escalating coal use after the Industrial Revolution, there came the widespread use of another fossil fuel, petroleum for transport. At the beginning of the 20th century, annual global oil output was about 150 million barrels of oil; now, that amount is extracted globally in just two days. Fossil fuels are classed as non-renewable sources of energy, formed from decayed plants and animals over hundreds of millions of years.