Why are methane and carbon dioxide called greenhouse gases Why is the atmospheric presence of greenhouse gases increasing?

The GHG gases are called that name as they enhance the retention of solar heat in the Earth'ds atmosphere.Carbon dioxide is increasing because we burn fossil fuels for energy while reducing the amount of plant and forest cover that could remove it from the atmosphere.

Methane is increasing because the farming practices around ruminants release digestive gases rich in methane. In addition the heating from the warmer air is releasing methane from permafrost and undersea methane hydrates..