Silk’s superpowers
Protecting Cows—and People—from a Deadly Disease
Chicken Eggs as Drug Factories
Frogs and Toads
Clone Wars
Little Beetle, Big Horns
Lucky Survival for Black Cats
Talking with Hands
The Snappy Lingo of Instant Messages
The (kids') eyes have it
Blue Jays
Chemistry and Materials
Atomic Drive
Spinning Clay into Cotton
Boosting Fuel Cells
Computers with Attitude
The Earth-bound asteroid scientists saw coming
Programming with Alice
Dinosaurs and Fossils
The Paleontologist and the Three Dinosaurs
Dino Flesh from Fossil Bone
Tiny Pterodactyl
E Learning Jamaica
2014 GSAT Results for Jamaican Kids
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Results of GSAT are in schools this week
Groundwater and the Water Cycle
Life trapped under a glacier
Detecting an Eerie Sea Glow
Seabirds Deliver Arctic Pollutants
When Fungi and Algae Marry
Giant snakes invading North America
Finding the Past
Traces of Ancient Campfires
Chicken of the Sea
Decoding a Beverage Jar
A Grim Future for Some Killer Whales
Pygmy Sharks
Food and Nutrition
In Search of the Perfect French Fry
Packing Fat
Moving Good Fats from Fish to Mice
GSAT English Rules
Adjectives and Adverbs
Order of Adjectives
GSAT Exam Preparation Jamaica
10 Common Mistakes When Preparing for the GSAT Math Test
Preparing for the GSAT Exam
The Annual GSAT Scholarships
GSAT Exams Jamaica Scholarships
Results of GSAT are in schools this week
GSAT Exam Preparation
Access denied - Disabled boy aces GSAT
GSAT Mathematics
Prime Time for Cicadas
Math and our number sense:
Losing with Heads or Tails
Human Body
A Better Flu Shot
Taste Messenger
Don't Eat That Sandwich!
Cocker Spaniels
Flying Foxes
Choosing a Preschool: What to Consider
The Surprising Meaning and Benefits of Nursery Rhymes
Children and Media
Powering Ball Lightning
One ring around them all
Project Music
Surprise Visitor
City Trees Beat Country Trees
Seeds of the Future
Black Mamba
Gila Monsters
Space and Astronomy
Burst Busters
Wrong-way planets do gymnastics
Rover Makes Splash on Mars
Technology and Engineering
Smart Windows
A Satellite of Your Own
Supersuits for Superheroes
The Parts of Speech
What is a Verb?
What is a Noun
What is a Preposition?
Morphing a Wing to Save Fuel
Where rivers run uphill
Tinkering With the Basic Bike
Recipe for a Hurricane
Catching Some Rays
Weekend Weather Really Is Different
Add your Article

Slower Growth, Greater Warmth

There seems little doubt that Earth is heating up. As temperatures rise, many people worry about how global warming may affect life on the planet. A long-term study in Central America gives one more reason for concern. Adult trees in a rain forest in Costa Rica grew more slowly in warm years than they did in cold ones. Such a shift toward slower-growing trees might make the climate warm up even faster. From 1984 to 2000, biologist Deborah A. Clark of the University of Missouri-St. Louis and colleagues measured the width of old trees in a 2-square-kilometer plot of rain forest at La Selva, Costa Rica. During the coolest years, a time period running from 1984 to 1986, the trees grew 81 percent faster than they did during a heat wave that struck in 1997. The trees also grew slowly in 1987, another warm year. In addition, scientists found that, during warm years, Earth's atmosphere contained less carbon dioxide produced by tropical land plants. Carbon dioxide is a heat-trapping gas, which plants normally use up to make food. The new results reinforce how important trees are to the health of the planet and how devastating a continued rise in temperatures might be to their future—and ours.—E. Sohn

Slower Growth, Greater Warmth
Slower Growth, Greater Warmth

Designed and Powered by™