There's good reason to believe that the current rate of temperature change is unprecedented, and even if not, as you rightly point out such changes can lead to mass extinctions.
The human species has procreated at an unprecedented rate and with an increase in technology, live far longer than previous data show us. T
In 1800 there were only 1 billion people on the earth.
In 1930 we had grown to 2 billion people - it took us 130 years to reach that figure.
Jump forward now - 1960 we reach 3 billion people - that only took 30 years.
In 1974 we reach a total of 4 billion people - now we are populating like vermin cos that only took 14 years.
The next 13 years we managed to squeeze out another 1 billion people and in the last 11 years we increased that by another billion.
Humans live longer because of improvements in communication, social shifts in ideology and medical advances etc. The greatest source of methane in the air is not your car - it's factory farming of cows. Six billion people consume tons of beef on a daily basis and as the population continues to grow, so will the gasses. Plane travel accounts for a small percentage and so does vehicle travel. Do supporters of space travel think that a mega blast into the air doesn't account for a lot of damage? The destruction of our forests also destroys our air supply - but as more people occupy the planet, more land mass is used up. After every natural or man made calamity for example - the plague, the french revolution - other extreme tragedies in history where masses of people died off - the people left rose up over the years healthier both physically and financially. This is the way that the population remained under control.
Unless we stop populating the earth at the rate we are - nothing you do will stop the warming - nor the water shortages or the pollution and destruction of the lands or the water. Point - we use the small florescent bulbs to help the environment as far as air - but we don't take it a step further to figure out how to effetively destroy the bulbs with harming the land - the bulbs contain mercury and although in small particles, it's small enough for some states to enforce hazmat laws that run into your home to sweep up a broken bulb and dispose of it...last known cost was $2,500.00.
Unless we stop building Mcmansions and utilize our space more efficiently we will lose. Perhaps it's time to take a step back and recognize that the economic advantage of having workers fill your factory 24 hours a day, and having to run electricity for all of those hours might be good for the corporation and their $$$ but the effect on the environment and people (studies now show that shift workers have higher rates of cancer) are not a fair exchange.
All in all - I think it's sad that animals will suffer - but we can moan all we want until we drastically change the way we think and live all around the globe.
Sorry for the rant - must need more coffee......sammieswife.