The other “strategic funder” of C40 cities, is Michael Bloomberg, a former New York Mayor.
Bloomberg has given $45million (£37million) to C40 cities, the network which he used to be chair of.
The organisation has called for people to reduce their meat consumption, limit their reliance on private cars, and only take one flight every three years.
The details of CIFF’s funding have been revealed in a report on the Clean Air campaign, which The Telegraph states it has seen.
The report’s authors, Together and Climate Debate UK, shed light on billionaires’ funding of climate organisations.
It alleges that “undue proximity between billionaires and the centre of political power” excludes the public from conversations.
CIFF have also donated more than £17million to the Clean Air Fund – the lobby group which claims responsibility for the implementation of Ulez
The report says that because many groups are funded by billionaires, there “are no grassroots air pollution campaigns of consequence”.
The report's author Ben Pile said: “Policies such as the Ulez should be driven by the public, not by billionaires whose interests have not been properly explored.”
Both authors said: “The public must be at the centre of political decision-making across all policy domains.
“Though air pollution policies may seem to have been driven by grassroots campaigns and scientific evidence, we have investigated these organisations and found that they are in fact almost exclusively supported by a small number of philanthropic foundations that are active in climate change lobbying, which have made air quality a proxy issue for the same agenda.
“The public has simply not been consulted, much less been free to participate in discussion about or vote on important questions.'