Globally, our climate has been relatively stable for the past 10,000 years. If the world does not take action to reduce greenhouse gas emissions, the global average temperature is very likely to change more rapidly during the 21st century than as a result of any natural variations over the past 10,000 years. This will make it difficult for plants and animals to adapt to climate change.
The climate system is very complex, and takes a long time to change. As a result, the effects of climate change will continue even if we reduce emissions now. Climate change is already affecting our climate. It is likely to impact our agriculture and other climate-sensitive industries, our native ecosystems, infrastructure, health and biosecurity, as well as having broader social and economic impacts. Climate change is real, the actions of mankind are the origin of climate change, and there is no know way to reverse climate change - we can only hope to slow the rate of change for the next several thousand years. These basic truths must be accepted by nations and form the basis for national policy.