Category: Tag: climate
What caused the Paleocene-Eocene Thermal Maximum (PETM)? About 56 million years ago, Earth’s temperature was a lot warmer than it is today–as much as 21°F higher than today (see the graph). Earth’s temperature is rising today, likely because of human emissions of greenhouse gases. But 56 million years ago, there were no human emissions; there […]
In science, less isn’t more; more is more. That basic premise is supported by a recent report from Lawrence Livermore National Laboratory: Separating signal and noise in climate warming. Earth’s overall temperature is affected by natural processes, such as La Niña and El Niño, as well as by human factors. From 1999 to 2008, Earth’s […]
NASA technology is being used to find fossil aquifers underneath Earth’s driest deserts. This technology was developed to explore underneath the surface of Mars, to help determine if there might be water on the red planet. Water is a sign that life might be possible. Why are they using this technology on Earth? We know […]
As plants grow, they transpire, releasing water into the atmosphere. During the summer in a city, trees help to cool the immediate surroundings through transpiration. New research from Carnegie’s Global Ecology department, published last month in Environmental Research Letters, concludes that transpiration has a global effect as well. How does this happen? Water vapor is […]
What does irrigation have to do with climate change? Possibly a lot. According to a new study from the University of Wisconsin-Madison, irrigation has increased agricultural productivity by an amount roughly equivalent to the entire agricultural output of the United States. That’s a lot of increased productivity! All of those growing plants take up more […]
Permafrost, the thick layer of soil that remains frozen throughout the year, currently holds a large amount of carbon. If the permafrost thaws, it will release the stored carbon, which could contribute to further warming. This is not new news. What is new is the idea that high latitude areas will become a carbon source […]
Scientists have known for a long time that ocean currents affect climate. The big unanswered question is how ocean currents change during the periods of greatest change–from ice ages to periods of global warming. During the Eocene period, 38 million years ago, the Antarctic had a temperate climate. What is now the midwest United States […]
A new study has been published disproving the previous explanation for the end of the Marinoan ice age, also known as “Snowball Earth.” That ice age ended abruptly about 600 million years ago. The debunked explanation stated that methane bubbled up from the oceans and was consumed by microbes, which released carbon dioxide into the […]
The Earth is getting warmer. In warmer climes, decomposition occurs more quickly. This releases more carbon dioxide into the atmosphere, leading to further warming. But it needn’t get completely out of control–trees (and other plants) can come to the rescue! A recent study in a central Massachusetts forest has shown that increased temperatures do indeed […]
A new study from the University of Colorado suggests that 66% of Earth’s permafrost could disappear by the year 2200. And this could be really bad for Earth’s temperature. If the temperature increases, the permafrost melts. Simple enough, right? But it’s slightly more complicated. Trapped in the permafrost is lots and lots of carbon–in the […]