A History Of Global Climate Change

d. all of the above

Even if global warming is a natural part of Earth's climate, human activities are accelerating it. Global temperatures are expected to rise much faster than they would have naturally, which may result in severe environmental and climate changes across the globe. These predicted impacts of global warming could have severe, negative impacts to humans.

b. rise 1.4-5.8ºC

a. Pollution was blocking sunlight.

Some groups point out that water is a more significant contributor to warming in the atmosphere. Therefore, they argue that carbon dioxide is not a significant greenhouse gas so any observed warming is not the result of human activity. To many of these groups any discussion of global warming or climate change is a form of media alarmism.

During an ice age the conditions on Earth favor glaciers and cold deserts over more hospitable environments. Therefore, when the ice age ended and glaciers retreated the more hospitable grasslands and forests that developed hosted greater biodiversity.

a. Europe

While many human activities produce greenhouse gases, the greenhouse effect is actually a natural process. Many atmospheric gases help trap heat in Earth's atmosphere, including natural gases like carbon dioxide. So while human activities exacerbate the natural greenhouse effect, it is not solely due to them.

a. too cold to support our current ecosystem

The advancing front of a glacier acts like a bulldozer, scraping across the landscape and carving out new features. This can carve out new courses for rivers and lakes and flatten out landscapes.

d. none of the above

true

b. Glaciers scraped across the surface and altered landscapes and the course of rivers.

c. Scientists mistakenly thought pollution reflected sunlight and heat rather than absorbed it.

c. respiration

d. Most climate scientists believe that there is evidence that explains global warming.

a. exacerbate the natural greenhouse effect

false

d. gases that trap energy from the sun in Earth's atmosphere

c. Australia