I wish that science functioned differently but it doesn't. Therefore one cannot conclude that there is a huge incentive to disprove global warming. Such a paper is actually quite hard to publish, and even if published such a finding could easily disappear, silently ignored, into the oblivion of our vast scientific literature.
Your assertion is true for theoretical reinterpretations of existing theory. Things like the germ theory, Einstein's changes to mechanics or atomic theory, the quantization hypothesis, continental drift, even the Copernican view were not accepted by contemporary scientists, being too large a jump from their accepted understanding.
On the other hand, what is the theory on climate change? Carbon dioxide causes temperature rise by a greenhouse effect. You can run that experiment in a terrarium. Nobody really disputes it. The Permian extinction was caused by massive increases in C02, due to Siberian volcanic action. We know what large amounts of CO2 do in the atmosphere, and have known for a hundred years.
So, given rising levels of CO2, the only real scientific question is how long it will take before the oceans rise, or storms start getting more severe. Scientists argue about that sort of thing all the time. Estimates change on a monthly basis, models are improved, new data is collected, etc. Science is doing its thing, which is to improve its predictions of the future.
There may well be an Einstein out there, who can take the data, and reinterpret it such that it is no longer necessary to limit greenhouse gas emissions. If he or she exists, it will take a long time before her theoretical reinterpretation of the data is accepted. However, assuming there is no way to reinterpret the data is the safer way to go,
Also, the deniers on /. aren't Einsteins, despite their claims to the contrary.