Match the climate change term in column 1 to the characteristic in column 2. Human activity

?

Produces greenhouse

gases

Sun's output

?

Peaked 20,000 years ago

Ice age

?

Can vary

Greenhouse

gases

?

Cause atmosphere to trap

more heat

Human activity  --  Produces greenhouse  gases.Greenhouse  gases  --  Cause atmosphere to trap  more heat.Sun's output  --  Can vary.Ice age  --  Peaked 20,000 years ago.

Explanation:

The human activity has created a large amount of greenhouse gases by the burning of fossil fuel and this fossil fuel is non-recyclable and causes the atmosphere to trap more heat and rise in global climate average. The ice ages have peaked in the past 10 - 20,000 years ago during the periods of interglaciation.

The name may be in importnce  to them

A. - canada and the u.s