I'm a vegetarian. I haven't purchased anything from the meat section of the store for 18 years. So the meat industry lost a consumer, did they roll back production? Nope. My personal impact could be rounded down to nil. All I can say is I am not contributing directly to that industry. Sound reasonable thinking there.
CFL light bulbs, aside from the horrible environmental pollution, icky light, the shorter lifespan, higher cost, they use less electricity. At a recent earth day fair it was being proposed that the mercury released into the environment (Your dump site has to have special equipment to dispose of these, you also have to hope people don't throw them into the garbage), was countered because of the lessor electricity use.
That is to say, because your using less electricity the power plants are generating less electricity and thereby releasing less mercury into the ground. I find the notion that electrical plants would produce less power laughable, just like my being vegetarian means there are animals out there being spared from slaughter.