The average global temperature refers to the long-term increase in Earth's surface temperature due to human activities such as burning fossil fuels, deforestation and other industrial processes. Full definition
• About 20 % to 30 % of all species face a «high risk of extinction» if average global temperatures rise another 1.5 to 2.5 degrees Celsius compared to 1990 levels. (globaleducationmagazine.com)
Although plants in the colder regions are expected to thrive as average global temperatures rise, even this benefit could be limited. (climatenewsnetwork.net)
Multiple independent analyses of long - term temperature records show average global temperatures rising as greenhouse gas concentrations have risen. (planet3.org)