Science Daily

Agricultural activity by humans more than 2,000 years ago had a more significant and lasting impact on the environment than previously thought.

A new study helps clarify how ammonia is present in Earth's upper atmosphere. Using computer modeling, the researchers found ammonia molecules trapped in liquid cloud droplets are released during convection where these particles freeze and subsequently collide in the upper atmosphere.

An international research team has found an increase in high waves and winds in the ice-free waters of the Arctic Ocean, a potentially dangerous navigational tipping point for the 'new and unusual' state of the waters.

The climate throughout Mars' early history has long been debated -- was the Red Planet warm and wet, or cold and icy? New research published in Icarus provides evidence for the latter.

Scientists have, for the first time, tracked the lives of leopard seals as they migrate around Antarctica. The team followed these formidable predators as they move from the frozen Antarctic sea-ice to the more northerly sub-Antarctic islands where they prey on penguins, seals and krill.

A new study uses previously unavailable data to confirm a correlation between the movement of plate tectonics on the Earth's surface, the flow of mantle above the Earth's core and the rate of reversal of the Earth's magnetic field, which has long been hypothesized.

Dinosaur-age fossilized remains of tiny organisms normally found in the sea have been discovered in inland, arid Australia -- suggesting the area was, for a short time at least, inundated by sea water 40 million years before Australia's large inland sea existed.

Although researchers have long known that the last two interglacial periods experienced warming in the Arctic due to changes in the Earth's orbit, a mix of fly species preserved from these times in a rare lake sediment core shows that Greenland was even warmer than previously thought. This information could help researchers better gauge Greenland's sensitivity to warming, by testing and improving models of climate and ice sheet behavior.

Half of Antarctica has long thought to be seismically dormant, but a researcher tripled the number of recorded earthquakes by monitoring for just one year.

New research has revealed that metal-related pollution began in the Balkans more than 500 years before it appeared in western Europe, and persisted throughout the Dark Ages and Medieval Period, meaning the region played a far bigger role in mineral exploitation than previously believed.

Study is first of its kind to reconstruct evolution of reef over 30,000 years in response to abrupt environmental change.

Glacial retreat in cold, high-altitude ecosystems exposes environments that are extremely sensitive to phosphorus input, new research shows. The finding upends previous ecological assumptions, helps scientists understand plant and microbe responses to climate change and could expand scientists' understanding of the limits to life on Earth.

Ancient rainfall records stretching 550,000 years into the past may upend scientists' understanding of what controls the Asian summer monsoon and other aspects of the Earth's long-term climate. Milankovitch theory says solar heating of the northernmost part of the globe drives the world's climate swings between ice ages and warmer periods. The new work turns Milankovitch in its head by suggesting climate is driven by differential heating of the Earth's tropical and subtropical regions.

Since the 1950s, warmer and warmer winters and man-made inflows have largely prevented ice formation on Europe's second-largest river.

Tiny gypsum crystals can make phytoplankton so heavy that they rapidly sink, hereby transporting large quantities of carbon to the ocean's depths.

A new study of ancient mound builders who lived hundreds of years ago on the Mississippi River Delta near present-day New Orleans offers new insights into how Native peoples selected the landforms that supported their villages and earthen mounds -- and why these sites were later abandoned.

Researchers have completed the first whole-genome analysis of ancient human DNA from Southeast Asia Study identifies at least three major waves of human migration into the region over the last 50,000 years, each shaping the genetics of Southeast Asia.

The 2018 report is out: two wolves, almost 1,500 moose and an ecosystem in transition. In its 60th year, the research conducted at Isle Royale National Park is the longest running predator-prey study of its kind.

A new global, satellite-based study of Earth's freshwater found that Earth's wet areas are getting wetter, while dry areas are getting drier. The data suggest this pattern is due to many factors, including human water management practices, human-caused climate change and natural climate cycles.

Inuit polar bear hunters in East Greenland report changes to their subsistence hunting patterns as well as polar bear distribution and behavior due to decreasing sea ice and the introduction of hunting quotas in 2006. The study is the first in nearly 20 years to document traditional knowledge in East Greenland -- providing a valuable baseline for monitoring future changes and the polar bear population.