Those say what the group believes is the reality of climate change, and its effect on the environment.
Christopher Cruise takes the story from there.
The answer to the climate problem could start with a huge solar project in the Mohave Desert, in the western American state of California. A company called NRG Energy began operating the project in February. NRG Energy President David Crane says it will provide enough electricity for 140,000 homes. He says that is a good start.
Our generation of leadership can get the ball rolling in fighting against climate change so that the next generation -- the people who are in their 20s and 30s today -- can finish the job.
Rajendra Pachauri is the chairman of the Intergovernmental Panel on Climate Change. He says projects like the one in California should be put in place worldwide. He says the report shows that is one way we can reduce climate change.
If we really want to bring about a limitation of temperature increase to no more than two degrees Celsius, then this is the message that comes out very clearly from this report.
The report says global greenhouse gas emissions must be lessened by 40 to 70 percent by the middle of this century. The goal is to prevent severe effects from strong weather events in a warmer world.
Nathaniel Koehane works at the Environmental Defense Fund. He leads efforts there to limit climate change. He told on Skype that changes can be made that will help stop the severe effects of climate change.
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