Question

this graph shows model predictions of the impact of natural forces alone, as well as the impact of human activities and natural forces, on global temperatures. it also shows the actual global temperatures that were observed from 1900 to 2000. how can this graph be used to inform decision - making at national and international levels? it provides information to encourage nations to do more studies on the natural forces that contribute to global warming. it shows why nations should invest in computer modeling software. it illustrates why nations should provide funding for scientific research. it provides information to encourage nations to reduce the production of greenhouse gases.

Explanation:

The graph shows that human activities (along with natural forces) have a significant impact on global temperatures (as the observed temperatures align more with the model that includes human effects). This information can be used to encourage nations to take action. Reducing greenhouse gas production (which is a result of human activities) would be a logical step based on this data. The other options:

• Studying natural forces more (first option) doesn't address the human - related impact shown in the graph.
• Investing in computer - modeling software (second option) is not directly related to the main message of the graph about the impact of human activities.
• Funding scientific research (third option) is too vague and doesn't specifically target the human - induced temperature change shown in the graph.

Answer:

It provides information to encourage nations to reduce the production of greenhouse gases.