A handful of errors in the 2007 IPCC Working Group II report were discovered in early 2010. They represent a tiny fraction of thousands of pages of findings in the complete report. To date, none of these errors has directly challenged the physical basis for detecting a human influence on Earth's climate.
The IPCC responded to these issues, as they report on their website. In March 2010, the United Nations and the IPCC asked the InterAcademy Council "to conduct an independent review of the IPCC’s processes and procedures to further strengthen the quality of the Panel’s reports on climate change." (IPCC, 2010 - PDF) The IAC is the umbrella organization for national academies of science around the world.
The IAC's report, released in August 2010, called the IPCC's process for producing assessments "successful overall," while recommending changes in management structure and procedures going forward, including greater transparency and communication. Many of these proposals have been put into place for the 2013–14 IPCC assessment.
Other concerns were raised in late 2009 when thousands of personal e-mail messages among several climate scientists were obtained without consent and posted on the Internet. UCAR and many other scientific organizations around the world responded to these concerns.
While the e-mail hacking incident raised a variety of issues, none of them directly challenged the major findings reported in climate change assessments, including the 2007 IPCC report.