Lesson 4 Toward Sustainability
Looking to Nature for Help
Our environment is ____ trouble.
With the planet becoming warmer, sea levels are rising and natural disasters ____ as forest fires and floods are increasing.
More and ____ waste is also being produced.
Plastic, in particular, ____ causing problems with soil and water pollution.
It is clear that ____ are a major contributor to the destruction of nature.
Will we be able to protect the environment ____ mountains of plastic?
Can we stop climate ____ from reaching dangerous levels?
Achieving these goals ____ difficult.
Nature, however, may ____ provided us with solutions to these problems.
Here are three areas ____ changes are already happening.
Dealing with Plastic Waste
About ____ percent of plastic is produced for single-use products.
That means the items are used just ____ and then discarded.
Do you ever stop to think ____ where these plastic items go after you throw them away?
Recycling can help reduce the amount of plastic ____ our landfills.
However, less than ten percent of the world’s plastic waste has been recycled so ____
Often, plastic waste is moved to places ____ it is just dumped or burned.
Furthermore,
Furthermore, between 8 and 14 ____ metric tons of plastic end up in the ocean every year.
This puts ____ marine species in danger.
With this in mind, ____ are turning to mealworms.
Mealworms are the ____ of a certain species of beetle.
Special bacteria live inside ____
____ bacteria can break down plastic.
This means that ____ can actually feed on plastic.
Scientists are now ____ for ways to cultivate the bacteria outside of mealworms.
They also want to speed up the process by which the bacteria ____ down plastic.
This may ____ us keep our landfills plastic-free.
Purifying Polluted Soil
Mining and ____ industries are causing soil pollution across the globe.
Although polluted soil can be dug up and transported to a landfill, this ____ is expensive.
Moreover, it only moves the problem to ____ area and does not really solve it.
Fortunately, there is an eco-friendly and cost-effective way to restore ____ soil—planting willow trees.
These amazing trees have ____ and well-developed root systems.
As a result, they naturally extract a wide range of harmful ____ from the soil.
They can also grow quickly, even in soil with ____ high acidity level or a lot of heavy metals in it.
Research on the effectiveness of ____ willow trees for this purpose is in development.
Scientists have found that some species of willow trees are able to absorb ____ materials better than others.
Therefore, this promising area should be further explored to find out which trees are the ____ effective.
In time, we may be able to clean up our land ____ willow trees.
Producing Algae Biofuel
Statistics show that about thirty to forty ____ of people in the world drink coffee each day.
The coffee-making process, however, generates used coffee grounds, which are normally sent to ____
____ they can create a harmful greenhouse gas.
____ there’s no way to stop everyone in the world from drinking coffee.
However, we can reduce greenhouse gas emissions by turning used coffee grounds ____ biofuel.
Biofuel is a natural fuel that is made from plant or ____ sources.
____ have found that they can grow algae on old coffee grounds without adding any other nutrients.
If these algae are exposed to twenty hours of light and four hours of darkness each day, they eventually ____ high-quality biofuel.
The biofuel is ____ and sustainable, and it creates only a small amount of emissions.
These ____ just a few solutions we can find in nature.
____ could be many more possible solutions to the problems we currently face.
It seems that Mother Nature has ____ us one more chance.
In return, we need to look for more ways to keep the environment healthy ____ clean.
If we do, the future of our planet may be bright after ____