They do not include most natural causes of climate change. (friendsofscience.org)
Even if some facts are liable to discuss, what remains in my opinion as the most encouraging sign is the openness on natural causes of climate change.. (notrickszone.com)
One of the greatest impediments to this knowledge, however, lies in the mandate of the UN's Intergovernmental Panel on Climate Change (IPCC), which limits itself to man - made causes and thus excludes a needed inquiry into natural causes of climate change. (ep.probeinternational.org)