We can control greenhouse gas emissions from burning fossil fuels. But we cannot control greenhouse gases from natural systems like thawing permafrost.
Scientists investigated walking speeds, a possible family grouping, population numbers, and a large individual.
Not all tyrannosaurs were Tyrannosaurus rex. That animal was just the last and largest of a group of carnivorous dinosaurs that includes over two dozen species, some of which were no bigger than turkeys.
They first appeared in the middle of the Jurassic Period, around 161 million years ago, and culminated with Tyrannosaurus rex at the end of the Cretaceous Period 66 million years ago.
A site in southern Utah, discovered in 2014, contained the remains of four individuals of Teratophoneus curriei, a species of tyrannosaur that lived about 10 million years before Tyrannosaurus rex. Other fossils at the site included clams, fish, turtles and a young giant alligator. Over a thousand bones were mapped and collected.
Teaching college students about climate change has its frustrations.
You try to help students understand how much human activities have already altered the atmosphere and climate. You explain biological feedback implications of these changes.
Do a good job, and students ask, “What can we do?”
Answer: Not much.
At least, not individually.
A recent New York Times article provides a case in point. It describes a “landmark” United Nations report for release next month that “declare(s) that slashing emissions of methane … is far more vital than previously thought” to limit climate change.
Plants synthesize sugar from carbon dioxide and water using sunlight energy. Plants modify and incorporate those sugars into their grass blades, leaves, roots, and wood. When they die, bacteria and other forces break them down.