The letter also takes aim at ExxonMobil's official claims that the "gaps in the scientific basis" make it very difficult to blame climate change on human activity. The Royal Society says that these claims are not consistent with scientific literature and misrepresent the science of climate change.
Bob Ward, the senior manager of policy communication at the Royal Society and the letter's official author, said, "It is now more crucial than ever that we have a debate which is properly informed by the science. For people to be still producing information that misleads people about climate change is unhelpful. The next IPCC report should give people the final push that they need to take action and we can't have people trying to undermine it."
The IPCC is the United Nations' Intergovernmental Panel on Climate Change. Their next report, due in February of next year, is expected to say that the Earth's temperature could increase higher than previously thought.
The actual letter can be found here (PDF).
[Source: Guardian via Energy Bulletin]