Petition

http://www.metoffice.gov.uk/climatechange/news/latest/uk-science-statement.html

Recently there has been a media explosion over the e-mails between some scientists released which apparently "prove" that scientists have been tampering with scientific evidence supporting global warming in order to make it seem more drastic than it is, etc.

I don't know full details about the topic, but I believe the issue is that for a graph displaying the levels of CO2 in the atmosphere they combined two methods of analysis in one graph; for past data they used tree-line dating to ascertain the levels of CO2 which where in the atmosphere and for modern/present-day they used direct sampling of the air quality. Both methods are reasonable, scientific methods and it should not skew the data to combine the results of the two into one graph. From my understanding the confusion has arisen because this point was not clearly stated on the graph. However, feel free to look into the subject further, as I really don't know too many details about it.

The link above addresses the concerns which have arisen as a result of these e-mails in a very clear manner, it is a petition signed by scientists stating unequivocally that the phenomenon known as "global warming" does exist and that there is no doubt that it is human-caused.