Anthony Watts has a t-shirt for sale, celebrating what deniers think of as success in making Earth more dangerous.
According to Anthony's t-shirt they didn't survive Y2K but those who are still around did survive 400 ppm of CO2.
Since science deniers are surprisingly into extreme risks, here's an even better t-shirt that would fit their jubilant mood and ambitions:
I don't know if they'll have the time (or attention span) to improve the t-shirt as I suggested. They are now busy arguing amongst each other over whether one denier camp's 'theory' that the earth is heading for an ice age is better or worse than the other denier camp's theory that the greenhouse effect doesn't exist and "all the physics is wrong" or another camp's theory that global warming is real but 'insignificant' and is caused by thunderstorms or another camp's theory that ENSO has suddenly decided to cause global warming.