biosphere

EARTH Magazine: Early Spring Thaw Triggers Arctic Greenhouse Gas Release

EARTH Magazine

From EARTH Magazine (AGI), March 20, 2017  --  The Arctic looks pretty inactive during the winter, but more may be happening than meets the eye.  According to a recent study, some carbon dioxide and methane are released during the early spring thaw, suggesting that critical processes are taking place during the Arctic winter. 

Westernmost, low-lying region of Louisiana coast on track to drown under sea level rise

Dead trees mark an area in Houma, Louisiana, transitioning from a forested swamp to a grassy marsh

From NSF, March 14, 2017  --  Little chance this shoreline can withstand accelerating rate of sea level rise, scientists say

Without major efforts to rebuild Louisiana's wetlands, which serve as bulwarks against waves and rising seas, the state's coast has little chance of withstanding the accelerating rate of sea level rise, a new study concludes.

EARTH Magazine: Harmful Algal Blooms Find New Habitats in Changing Oceans

EARTH Magazine

From AGI, January 19, 2017  --  In April and May 2015, a bloom of toxic algae spanned more than a thousand miles of Pacific coastline, from Santa Barbara, Calif., to British Columbia. Marine organisms were poisoned throughout the food web, disrupting coastal ecosystems and economies for months. Similar events are expected to become more frequent as the oceans and atmosphere adjust to a warming climate.

EARTH Magazine: The First Americans: How and When Were the Americas Populated?

EARTH Magazine

From EARTH Magazine, January 4, 2017  --  The latest research suggests humans first arrived in the Americas as early as 16,000 years ago, but using which path — along the Pacific coast, through an inland ice-free corridor, or from the East along the Atlantic coast — remains controversial. Archaeologists and geologists are working to try to answer the question of how and when the first Americans arrived. In the January issue of EARTH Magazine, their work is showcased, reexamining the origins of our shared geoheritage in light of new evidence.

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