Climate change is a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. It may be a change in average weather conditions, or in the distribution of weather around the average conditions (i.e., more or fewer extreme weather events). Climate change is caused by factors that include oceanic processes (such as oceanic circulation), variations in solar radiation received by Earth, plate tectonics and volcanic eruptions, and human-induced alterations of the natural world; these latter effects are currently causing global warming, and "climate change" is often used to describe human-specific impacts.

Scientists actively work to understand past and future climate by using observations and theoretical models. Borehole temperature profiles, ice cores, floral and faunal records, glacial and periglacial processes, stable isotope and other sediment analyses, and sea level records serve to provide a climate record that spans the geologic past. More recent data are provided by the instrumental record. Physically-based general circulation models are often used in theoretical approaches to match past climate data, make future projections, and link causes and effects in climate change.

William Sanford "Bill" Nye (born November 27, 1955), popularly known as Bill Nye the Science Guy, is an American science educator, comedian, television host, actor, mechanical engineer, and scientist. He is best known as the host of the Disney/PBS children's science show Bill Nye the Science Guy (1993–1998) and for his many subsequent appearances in popular media as a science educator.

William Sanford Nye was born in Washington, D.C., the son of Jacqueline (née Jenkins; c. 1920–2000), a codebreaker during World War II, and Edwin Darby "Ned" Nye (died 1997), also a World War II veteran whose experience in a Japanese prisoner of war camp led him to become a sundial enthusiast. Nye is a fourth-generation Washington, D.C. resident on his father's side of the family. After attending Lafayette Elementary and Alice Deal Junior High in the city, he was accepted to the private Sidwell Friends School on a partial scholarship, graduating in 1973. He studied mechanical engineering at Cornell University, where one of his professors was Carl Sagan, and graduated with a Bachelor of Science in 1977. He was awarded an honorary doctorate by The Johns Hopkins University in May 2008. In May 2011, Nye was awarded an Honorary Doctor of Science degree from Willamette University where he was the keynote speaker for that year's commencement exercises.

Marsha Wedgeworth Blackburn (born June 6, 1952) is the U.S. Representative for Tennessee's 7th congressional district, serving since 2003. She is a member of the Republican Party. The district stretches from the suburbs of Nashville to the suburbs of Memphis.

Born Marsha Wedgeworth in Laurel, Mississippi, Blackburn attended Northeast Jones High School and graduated from Mississippi State University where she joined Chi Omega, and where she also spent a few summers working with the Southwestern Company. She owned and operated a marketing company in Williamson County Tennessee.

Blackburn began her political career in 1977 as a founding member of the Williamson County Young Republicans. She served as chairwoman of the Williamson County Republican Party from 1989 to 1991. Her elective political career began in 1992, when she won the Republican nomination for the 6th District, which at the time included her home in Brentwood. She lost by 16 percentage points to longtime congressman Bart Gordon. In 1995, she was appointed chairwoman of the Tennessee Film, Entertainment & Music Commission. She won elective office for the first time in 1998, when she was elected to the Tennessee State Senate, representing Williamson County and a sliver of Davidson County. She led efforts to prevent the passage of a state income tax championed by Governor Don Sundquist.

Sir David Frederick Attenborough ( /ˈætənbərə/) OM, CH, CVO, CBE, FRS, FZS, FSA (born 8 May 1926) is a British broadcaster and naturalist.

His career as the face and voice of natural history programmes has endured for more than 50 years. He is best known for writing and presenting the nine Life series, in conjunction with the BBC Natural History Unit, which collectively form a comprehensive survey of all life on the planet. He is also a former senior manager at the BBC, having served as controller of BBC Two and director of programming for BBC Television in the 1960s and 1970s.

Attenborough is widely considered a national treasure in Britain, although he himself does not care for the term. He is a younger brother of director, producer and actor Richard Attenborough.

Attenborough was born in Isleworth, west London, but grew up in College House on the campus of the University College, Leicester, where his father, Frederick, was principal. He is the middle of three sons (his elder brother, Richard, became an actor and his younger brother, John, an executive at Italian car manufacturer Alfa Romeo). During World War II his parents also adopted two Jewish refugee girls from Europe.

Gavin A. Schmidt is a climatologist and climate modeler at the NASA Goddard Institute for Space Studies (GISS) in New York. He works on the variability of the ocean circulation and climate, using general circulation models (GCMs). He has also worked on ways to reconcile paleo-data with models. He helped develop the GISS ocean and coupled GCMs to improve the representation of the present day climate, while investigating their response to climate forcing. The latest GISS GCM is called ModelE.

He is the co-author, with Joshua Wolfe, of Climate Change: Picturing the Science (2009), which has a foreword by Jeffrey D. Sachs. The book combines images of the effects of climate change with scientific explanations.

In October 2011, the American Geophysical Union announced that Schmidt was to be awarded its inaugural Climate Communications Prize for his work on communicating climate-change issues to the public. The award is to be presented at the AGU's Fall Meeting in December. The award news release noted his outreach work including co-founding and contributing to the RealClimate blog.