Energy saving lightbulbs,
We're going to run out of standard filament in like 20 years anyway. Might as well use it while we got it.
turning down the temperature of a washing machine
But then my clothes might not be sterile which could result in contraction of illness, perhaps even the generation of a global pandemic like bubonic plague. Then what's the point of saving the environment if we're all dead?
only boiling the water you need in a kettle,
What about cooking things like pasta that need to sit in boiling water?
not using a car for short journeys
What's a short journey? How much pollution can a "short journey" generate? What about the time it takes to get somewhere for time=money.
car sharing and use of public transport
Public transit in many areas stinks, and I hate to be at the will of other people when it comes to reaching a destination.
turning the thermostat down 1 degree
What if you already keep it low? Honestly, there's a threshold for this stuff. You can't just make a blanket statement to tell people to turn down their thermostats regardless of what temperature it is, most people tend to keep it lower due to rising energy costs anyway,.
These are all small changes we could make to help save the environment.
Actually, the term "save the environment" really makes no sense, the environment would still exist even if the polar ice caps melt, it'd just be a different environment.