Lawson used the article to accuse climate scientists of "manipulating" records of global temperature and of refusing external scrutiny of their raw data, while also calling for a "an open and reasoned debate" about domestic and international climate change policies.
But despite his apparent enthusiasm for greater transparency by climate researchers, Lawson has been less than forthcoming about how the foundation is funded. According to its latest annual accounts, the foundation received £12,161 from membership fees in the year ending 31 July 2012.
As the annual membership fee is "at least £100", it appears that the foundation has 120 members at most.
The identity of the donors is shrouded in secrecy. The foundation's website states that it is "funded overwhelmingly by voluntary donations from a number of private individuals and charitable trusts", and that it "does not accept gifts from either energy companies or anyone with a significant interest in an energy company".
Lord Lawson has consistently refused to disclose the name of the donors. When interviewed by BBC Radio 4 last October, he said that he relied on his friends who "tend to be richer than the average person and much more intelligent than the average person".
However, membership fees are only a minor source of revenue for the foundation. Accounts show that it has received more than £1m in donations over the past three years.
So what does Lord Lawson do with all this money? Although the foundation is registered as an educational charity, its primary purpose seems to be to campaign against policies to tackle climate change by reducing emissions of greenhouse gases.
The public relations company has attracted controversy because of its claims of influence over senior members of the government. In December 2011, the Bureau of Investigative Journalism uncovered evidence that senior executives of Bell Pottinger boast of their contacts with the prime minister and the chancellor.