Twenty-four trains, nine countries, 13,500 miles.

They are the numbers behind a train journey one man took from Southampton in the UK to eastern China. Roger Tyers, 37, spent a month on board trains and over $2,500—almost three times the cost of a return flight—to travel to the Chinese port city Ningbo for academic research in May, 2019. It was the climate crisis that drove this socialist to choose this complex route. Tyers told CNN that he felt it necessary to stop flying when UN climate experts warned last year that the world has less than 11 years to avoid disastrous levels of global warming.

Tyers is not the sole person to avoid air travel in response to climate change. Thousands of people worldwide have publicly promised to stop flying, including teenage activist Greta Thunberg, who has inspired youth climate protests around the world. Activist Maja Rosen started the "Flight Free"campaign in Sweden in 2018 with the aim of encouraging 100,000 people not to fly for one year.

Rosen, who stopped flying 12 years ago, says the "Flight Free"campaign helps fight the sense of hopelessness many people feel when it comes to dealing with climate change. "One of the problems is that people feel there's no point in what you do as an individual. The campaign is about making people aware that if we do this together, we can actually make a huge difference,"she said.

A passenger's footprint from an individual flight depends on a number of factors, including how far he flies, how full the plane is, and what class he travels in: First class passengers are given more space than economy passengers, meaning they're responsible for a bigger part of the plane's emissions. Tyers said that his train journey to China produced almost 90% less emissions than a return flight.

What made Tyers go to China by rail? (no more than 5 words)

    You don't have to spend money or even leave your desk to protect the environment. Here's how to do your bit.

    ● Buy nothing

    "Stop shopping—start living" is the slogan (口号) of the Buy Nothing Day (BND) movement. Every 24th or 25th November, activists take a 24-hour retail (零售) break and… stop shopping!

    BND was founded in 1992 by Canadian artist Ted Dave and it has been a great success ever since. People stop shopping on the day, expressing their concern about the environmental problem. So if you are used to shopping every day, BND gives you a chance to have a break! You might change your habit not just for one day, but for life!

    ● Stop eating prawns

    You've probably got prawns ready for a quick and easy meal. But how are they produced? Well, most prawns come from Asia and Latin America, where they are fished or farmed.

    Unfortunately, prawn fishing causes harm to marine (海洋的) life because huge nets are pulled along the sea bottom. 10 kilos of dead fish are thrown away for every kilo of prawns caught. Prawn farming is no better—a lot of forests are destroyed to make room for the farms. So think again about the prawns on your plate!

    ● Save the rainforest

    Now only 2 million square miles of rainforests are left, and another 1% is being destroyed every year. The trees are being cut down for their wood, and the remaining rainforests could have been used by 2050. Over half of the world's plant and animal species are found in rainforests. It is believed that extinctions (灭绝) take place every day due to cutting down trees.

    Why not go to www. worldlandtrust. org? Donate the price of a cinema ticket for a piece of rainforest. It will be saved with your simple click of the mouse. If we don't act，in 30 years from now the rainforests will have been destroyed.