Greenhouse gases are needed to keep the Earth warm enough to support life but ... is the main source of excess greenhouse gases in the atmosphere. a.Deforestation b.Factory farming c.Human use of fossil fuels d.Population

What use does white vinegar have around the home? a. Natural cleanser and disinfectant b.Natural cat litter c. Natural toothpaste d. Natural paint remover

Rainforests once covered 14% of the earth's land surface; now they cover .... a.6% b.8% c.10% d.12%

Global warming may ... a.Influence the length of seasons. b.Cause coastal flooding. c.Lead to more frequent and severe storms. d.All of the above

Which country is the #1 trash-producing country in the world at 1,609 pounds per person per year. A. Turkey B. USA C. China D. Russia

How long does it take for glass to decompose? a.100 years b.About 500 years c.1000 years d.One million years

Which country currently emits the most greenhouse gases? a.Russia b.China c.The USA d.Germany

Petroleum, coal and natural gas are all ... a.Environmentally friendly b.Non-polluting c.Renewable d.Fossil fuels

What is Earth’s warmest year on record? A) 2008 B) 2012 C) 2016 D) 2020

Global warming is caused ... a.Only by human activity. b.Only by natural factors. c.Mainly by natural factors. d.Both by human and natural factors

The layer of protective gases that shields the earth from harmful radiation. It is the second layer of the earth’s stratosphere that protects us from the sun’s ultraviolet radiation.

You burn more calories ... A. sleeping B.watching TV