Wasting less food is a way to reduce greenhouse gas emissions. 

The overwhelming majority of scientists agree that climate change is real and caused by humans. 

The amount of carbon dioxide CO2 in the atmosphere is decreasing.

Greenhouse gases do not serve a helpful purpose on earth. 

The weather is the same as climate. 

Kyoto Protocol is an international treaty that controls global warming by setting greenhouse gas emissions targets for developed countries. 

Water vapor is a greenhouse gas that is the main driver of Earth’s current warming.

Some kinds of pollution in the atmosphere can act to cool the planet by reducing the amount of solar radiation that reaches Earth's surface. 

Climate refers to is something that happens on a daily basis in the atmosphere – air temperature, rain, snow, wind, etc. 

The phenomenon wherein there is a gradual increase in average global temperature is what we called greenhouse effect.