Sharon Oosthoek | Science News for Students

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Sharon Oosthoek

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a photo of a suburban road lined with trashcans and trees

Many cities plant trees to absorb CO2 and stop temperatures from rising to dangerous levels. But a new study shows city trees grow faster and die younger than forest trees. That means city trees will absorb less CO2.

mastersky/iStock/Getty Images Plus

 Environment
City living makes trees grow fast but die young
Urban trees may not remove as much carbon dioxide, a greenhouse gas, as rural trees
a photo of Steve Perlman rappeling down a verdant cliff over turquoise waters

Steve Perlman rappels down a cliff in the Wailau Valley on the Hawaiian island of Molokai. He is a botanist who has spent the last 45 years searching for, and protecting, rare plants

Hank Oppenheimer

 Plants
Rare-plant hunters race against time to save at-risk species
Scientists rappel down cliffs and trek through forests to collect plants and seeds
an underwater photo of mosquito larvae

Mosquitoes start their lives as larvae that live in water. They chow down on algae and bacteria — and tiny bits of plastic, if they happen to be around.

ApisitWilaijit/istockphoto

 Pollution
Microplastics take flight in the bellies of mosquitoes
The pollution stays in these insects as they grow from larvae to adults, putting birds at risk
young orang

This young orangutan has lived its whole life in the jungle. Others raised in captivity no longer know what it means to be wild. Before they can join this one, they must go to boot camp for basic survival skills.  

Lillian Tveit/iStockphoto

 Sustainability
‘Boot camp’ teaches rare animals how to go wild
Scientists teach captive-reared endangered species such vital skills as finding food and avoiding predators
water bottles

In recent tests, bottled water from nine countries contained tiny plastic bits. The microscopic pieces may come from a variety of sources including cosmetics, clothing and packaging materials.

yanik88/istockphoto

 Pollution
Plastic taints most bottled water, study finds
Researchers don’t know whether drinking the microplastic bits might pose health risks
contaminated water
This pretty Canadian stream hides a dirty secret: It is downstream of a water-treatment plant that releases low levels of pollutants. Researchers caged fish here to test how pollution affects their vitality.
McMaster University
 Pollution
Fish get pooped living in polluted water
Pollutants flushed down toilets — and into the environment — tire fish, which could make finding food and avoiding predators harder