Question

if u answer it fast and reasonably then I will mark u the brainliest ...

And if u give inappropriate answer I will report u

Answer 1

a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants  
   *causes*
Global warming is caused by human activities like burning fossil fuels, deforestation and farming.
When we burn fossil fuels like coal, oil and gas to create electricity or power our cars, we release CO2pollution into the atmosphere.. 
   *methods to decrease
Change light bulbs to compact fluorescents or LEDs. Unplug computers, TVs and other electronics when not in use. 
Buy organic and locally grown foods

Answer 2

Global warming ➡A gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.

What causes global warming➡Global warming occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. Normally, this radiation would escape into space—but these pollutants, which can last for years to centuries in the atmosphere, trap the heat and cause the planet to get hotter. That's what's known as the greenhouse effect.

How we can reduce it➡

1.) Use Fluorescent Light Bulbs
2.) Switch Off Electric Appliances
3.) Plant Trees At Home
4.) Save Clean Water
5.) Uses of Solar Energy