Stories by Jeff Tollefson

A Nature survey reveals that many authors of the latest IPCC climate science report are anxious about the future and expect to see catastrophic changes in their lifetime

A landmark assessment from the Intergovernmental Panel for Climate Change says greenhouse gases are unequivocally driving extreme weather, but nations can still prevent the worst impacts

The first assessment from the Intergovernmental Panel for Climate Change in eight years will sound the alarm on soaring temperatures and other effects of unchecked carbon pollution

Researchers are applying strategies honed during the 2020 US presidential election to track anti-vax propaganda

As the U.S. president announces his advisers and agency heads, Nature’s guide tracks the appointees who matter most to science

The new president has the opportunity to reverse four years of anti-science policies—but he has a hard road ahead as he inherits a nation divided

The coronavirus pandemic, climate change and space exploration are among the issues that Biden will influence if he wins the upcoming U.S. election

U.S. research sees deep cuts in the president’s request for 2021. But Congress has resisted similar reductions in the past

Researchers without access to backup power scramble to save invaluable specimens and expensive reagents

A new U.N. report predicts more powerful storms, increased risk of flooding and dwindling fisheries if greenhouse-gas output doesn’t fall

Critics say the shift away from using animals in safety tests will hamper chemical research and regulations

Tensions are rising as Jair Bolsonaro’s administration questions the work of government scientists and institutes debilitating cuts to research funding

A new rule for the U.S. Environmental Protection Agency allows states to set their own limits on carbon-emission levels

Landmark UN-backed report finds that agriculture is one of the biggest threats to Earth’s ecosystems

The president wants to cut spending at the National Institutes of Health and Environmental Protection Agency, but it is not clear whether Congress will go along

A second wave of closures looms as the government funding fight barrels towards a record-breaking fourth week

Radar instrument aboard a Japanese probe can spot signs of gas seeping from lakes that form as the ground thaws

Humanity has a limited window to avoid the more dire effects of climate change, according to a new climate report

Extreme heat events wreak havoc on marine ecosystems and will only get worse in coming decades

Critics outraged over changes to chemical-safety review guidelines

Uncertainty, hostility and irrelevance are now part of daily life for scientists at the U.S. Environmental Protection Agency

The Cerrado is the most threatened biome in Brazil, environmentalists proclaim

Independent board will review agency decisions to repeal or change climate regulations and rules on the use of non-public data

The Environmental Defense Fund is working with researchers at Harvard University on the probe