That would be a testable hypothesis that you have not tested. Anybody can do whataboutism but it isn't a meaningful argument. If it's your belief that the literature is biased by 'green' funding, prove it.
Engaging with the existing literature would be a good start.
If you were interested in studying the relationship between bias and funding you might do a survey of published papers and articles on the subject.
If you can identify some measurable criteria that can be used to rate how "green" a paper's funding is then you can use that as an axis and compare the surveyed papers to reveal trends.
