Question

how do we know global warming is real​

Answer 1

Increase in average temperatures and temperature extremes

• One of the most immediate and obvious effects of global warming is the increase in temperatures around the world.

Answer 2

Explanation:

The simplest way is through temperature measurements. Agencies in the United States and Europe have independently analyzed historical temperature data and reached the same conclusion: the Earth's average surface temperature has risen roughly 0.8° Celsius (1.4° Fahrenheit) since the early 20th century.