2 . Do you know how to cycle? It is a skill that, once learned, is never forgotten. For the majority of us, the art of balancing on two wheels was mastered during our childhood. Many still wear helmets, put feet on the pedals, and take a ride around the streets. And in recent years, cycling has become more and more popular. What attracts people to ride their bikes once again?

Cycling offers a lot of advantages that affect both our physical and mental health. For example, regular cycling can improve the function of our cardiovascular (心血管的)system, assist in the burning of extra body fat and strengthen our leg muscles. A long ride in the countryside helps us to clear our mind easily.

Riding a bike is a smart choice for getting to work, shopping, or sightseeing. You can save money that you would otherwise spend on fuels and fares. Unlike cars that struggle with parking, bikes can be easily locked up. Then, on the train, there are chances at stations and other people speaking loudly on their phones. Cyclists face neither of these problems. And if we’re worried about safety, there are cycle lanes in many cities, or we can wear light-colored clothes to improve our safety when cycling on the roads.

Cycling can also be good for the environment. It cuts our carbon footprint, which means we make less pollution. It’s great for our planet and keeps the air clean around us. When we ride bikes, we don’t use fuel like cars do, and that’s really good for our environment.

Therefore, more and more people choose to ride for many benefits such as improving their health, easily going to work, saving money, protecting the environment, or a combination of these factors.

4 . It is late autumn—millions of gardeners across the northern hemisphere, pulled on their thickest sweaters, spent hours clearing large piles of leaves and packed them into plastic bags at the end of driveways.

In the US alone, nearly 10 million tonnes of garden waste go to landfill every year. That is a large amount of effort, not just from an environmental viewpoint but from that of our aching backs, too. So where does this advice come from? Well, it largely comes from the belief that thick fallen leaves can make plants under them unable to breathe, especially shorter grass. They shut down important photosynthesis (光合作用) and get in the way of the growth of the shorter grass. However, this received wisdom has recently been questioned by researchers at Wisconsin University.

The key finding of their new research was that although clearing fallen leaves is one of the most common gardening practices, it makes very little sense. In natural ecosystems, fallen leaves help return nutrients necessary for healthy plant growth to the soil, which greatly improves soil condition. Removing leaves year after year breaks this ecological (生态的) balance. Letting some leaves stick around to cover your garden is a great way to help your grass and the local ecosystem.

They further explained that if up to 50percent of your grass lawn (草坪) is covered by fallen leaves, you might as well go back indoors and put your feet up. The advantages of this light leaf coverage far outweigh the disadvantages—the leaves will quickly break down and help next year’s lawn grow far better than if you had cleared them. Only at over 50 percent coverage do the Wisconsin researchers recommend clearing.

So why not consider leaving the leaves? Save time, carbon and effort, and in exchange get a healthier lawn from this garden waste—that seems like a pretty good deal. And how many plastic bags could be saved by simply not binning fallen leaves every year? In the US alone, about 700 million.

The World Health Organization (WHO) has announced a shocking finding about the air we breathe. It has found that almost everyone on Earth breathes unhealthy air. The WHO made     1    (it) air quality update ahead of World Health Day on April 7. The update reported that 99 per cent of the world’s population breathes air     2     goes beyond WHO air quality limits. It looked at data from over 6,000 cities in 117 countries. People     3    (live) in lower- and middle-income countries breathe the poorest-quality air. Millions of people die in these countries because of pollution-related diseases. The WHO said: “After surviving a pandemic, it is unacceptable to still have 7 million preventable deaths due     4     air pollution.”

The WHO said its report highlighted the need to move away from fossil fuels. It asked governments to do more     5     (reduce) levels of air pollution. It said: “Current energy concerns highlight the importance of speeding up the transition to cleaner and     6    (healthy) energy systems.” It added that high gas prices, energy     7    (secure), the dangers of air pollution, and climate change mean the world must be less dependent on fossil fuels. The WHO report     8    (include) many recommendations for change. One of these is     9     use of clean energy for cooking, heating and lighting. Another is to “build safe and affordable public transport systems and pedestrian- and cycle-friendly     10    (network)”.

6 . Picking up litter is a fun, simple, and free activity that can have instant results for your child and your community.

Plastic bag to collect trash (垃圾)

Gloves—especially important as we practice COVID-19 safety measures

Optional: pick-up stick, a separate bag for recyclables

1. Assign gloves and a trash bag to each family member.

2. Clear out litter from an area of a park, beach or your own neighborhood. Take all necessary precautions (防范措施), including wearing sturdy (结实的) gloves, being careful on river banks or near roads, having adults handle dangerous items, and supervising children closely.

3. Properly dispose of all litter.

Why is it important to pick up litter?

How can you inspire others to help keep the neighborhood clean?

Colonel Trash Truck by Kathleen Crawley

The colonel is on a mission to protect the beauty of the earth by cleaning up litter-and convincing others to do the same.

Here Comes the Garbage Barge ! by Jonah Winter

This story is sure to inspire your whole family to be mindful of your environmental impact.

Take a few digital photos of what you’ve picked up. Then send an essay about your experience along with your favorite photos, your name and address to mail@ wildernessproject.org. Your essay will be published on the Nicodemus Wilderness Project website, and you’ll get an official certificate. For tips on conducting the clean-up and writing the story, as well as essays and photos from other people, visit the website.