FACTBOX: U.N. panel lays out risks, solutions to warming

(Reuters) - Following are findings of the U.N.'s Intergovernmental Panel on Climate Change in a 23-page summary about the risks of global warming issued on November 17:

* OBSERVED CHANGES

"Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice, and rising global average sea level."

* CAUSES OF CHANGE

"Most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in ... greenhouse gas concentrations" from human activities.

Annual greenhouse gas emissions from human activities have risen by 70 percent since 1970. Concentrations of carbon dioxide, the main greenhouse gas, far exceed the natural range over the last 650,000 years.

* PROJECTED CLIMATE CHANGES

Temperatures are likely to rise by between 1.1 and 6.4 Celsius (2.0 and 11.5 Fahrenheit) and sea levels by between 18 cm and 59 cm (7 inches and 23 inches) this century.

Africa, the Arctic, small islands and Asian mega-deltas are likely to be especially affected by climate change. Sea level rise "would continue for centuries" because of the momentum of warming even if greenhouse gas levels are stabilized.