enhanced greenhouse effect![click to hear](/images/speaker.jpg)
Human activity constantly emits greenhouse gases, which trap ever more heat in the atmosphere.
air conditioning system ![click to hear](/images/speaker.jpg)
Air conditioning systems use chlorofluorocarbons (CFCs) that absorb infrared rays and damage the ozone layer.
intensive husbandry ![click to hear](/images/speaker.jpg)
Raised in great numbers, ruminants emit methane as a by-product of digestion.
intensive farming ![click to hear](/images/speaker.jpg)
To obtain the maximum yield, intensive farming uses chemical fertilizers that are responsible for various forms of air and water pollution.
global warming ![click to hear](/images/speaker.jpg)
Temperatures have increased by 0.5% in the last century; continued rises in temperature could result in major climate changes.
greenhouse gas concentration ![click to hear](/images/speaker.jpg)
Increasingly abundant greenhouse gases reflect more and more infrared rays toward the Earth’s surface, accelerating global warming.
fossil fuel ![click to hear](/images/speaker.jpg)
The combustion of wood and fossil fuels (coal, oil, natural gas) emits carbon dioxide and methane into the atmosphere.