"Luckily, I was being brought up in a way that we (as children) had to be very conscious about using energy, water, food - basically: never waste anything. - this was the "norm" in the post-communist Eastern Europe in the early 90s - which is where I am from.
A new habit is that I turned vegetarian 5 years ago. Purely on the basis of GHG (greenhouse gas) emissions coming from meat production. Since then a lot of my close friends also turned vegetarian. In London, it's actually not even difficult - there is so much variety!
And I am very proud that I convinced a large number of friends to change careers to get involved in sustainability!"