Is the climate warming?
National Climatic data Center NCDC is the world's largest active archive of weather data which includes National Oceanic and Atmospheric Administration NOAA data. Its FAQ page answers in the affirmative to the question Is the climate warming?

Tackling Climate Change Skeptics
The New Scientist has compiled a list of FAQs on climate change to dispell myths and misconceptions

Data from the Hadley Centre
The Met Office Hadley Centre is the UK's official centre for climate change research. Partly funded by Defra (the Department for Environment, Food and Rural Affairs), they provide in-depth information to, and advise, the Government on climate change issues. Many important datasets are provided including the Hadley Centre Central England Temperature (HadCET) dataset

Evidence from Goddard Institute for Space Studies GISS
GISS is a laboratory of the Earth Sciences Division of NASA's Goddard Space Flight Center. The GISS temperature analysis scheme provides a method of estimating global temperature change. NASA news releases about the GISS surface temperature analysis are available for 2007, 2006, 2005, and 2004

Common Myths about Climate Change
Prof. John Mitchell OBE FRS, Chief Scientist at the Met Office explores some of the common myths about climate change including solar activity and cosmic rays