What is Climate Change?  A simple question to ask, but a complicated question to answer. This Forum session of distinguished scientist leaders helps to define a clear picture of what the U. S and the World are dealing with in climate change. The panels will examine a variety of topics that improves understanding of climate change, such as, what is happening to the Earth driven by climate change. How do we observe climate change? What are the human drivers? How are human health and the health of the planet affected by climate change? How do we reach society to educate, respond, cooperate, and implement solutions? How do we study and report on climate change? What are the most notable gaps in how we respond to climate change? What type of technologies can be brought to bear to mitigate and adapt to climate change?  What role should government play in addressing climate change and partner with industry and the public to bring about meaningful solutions?  How do government agencies begin to address climate change within their mission scope and funding?