Despite what you might think, it is not the lights in your house or the hot shower in the morning that leave the deepest greenhouse gas footprint on the climate. Actually, 80% of CO2 comes from the products and services that you choose – including what you eat and drink. So one of the easiest ways to cut emissions is to change your eating habits. Drink tap water instead of bottled, eat less meat and stop wasting food.

- The energy consumption of humans and the production of foods is the primary source of greenhouse gasses. Therefore, only we can act, says Katherine Richardson, professor at the University of Copenhagen’s Sustainability Science Centre.

80% of CO2 comes from the products and services that you choose – including what you eat and drink

How you get around is also an important factor. In contrast to what many people think, quitting flying is not the quickest way to cut emissions. Airplanes are of course heavy emitters of CO2, but since flying for most people is a rare thing, the overall impact is less significant. Driving a car, on the other hand, happens on a daily basis. If more people used alternative modes of transport, it would have a crucial effect on the environment.

The most important piece of advice of all is simply to reduce spending and stop wasting. As Katherine Richardson says:

- A real climate-saint is a person who watches their environmental resources as careful as they watch their finances.

Our planet’s resources are crucial for our survival and we are beginning to see this more clearly, according to Katherine Richardson. She believes that – as with smoking – humanity will suddenly speed up and go green for the sake of our own health.

- Saving the planet is at huge thing to cope with. But saving society is much more comprehensible. And that is what this is about. I believe that these changes will begin to pick up speed, because we can see the importance of acting for our own sake. Look how fast things happened with cigarettes. For this reason, I don’t encourage leaning back, because we have a very short span of time within which to take effective action, she says.