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Through the Paris Agreement, the world’s countries agreed to work to keep global warming well under 2 degrees Celsius. Saeed Khan/AFP via Getty Images

Why the US rejoining the Paris climate accord matters at home and abroad — 5 scholars explain

The US is formally back in the Paris climate agreement as of today. As one of the world’s largest greenhouse gas emitters, it has a lot of work to do, with food security, health and safety at stake.
The new SARS-CoV-2 variant’s increased transmissibility is believed to come from a change in the spike protein, visible here in yellow under an electron microscope. National Institute of Allergies and Infectious Diseases

How to stay safe with a fast-spreading new coronavirus variant on the loose

The new SARS-CoV-2 variant is already spreading in the US and could be dominant by March, the CDC warns. Here’s what that means for the masks you choose and how you practice social distancing.
People protest outside the Tendercare Living Centre long-term-care facility in Scarborough, Ont. on Dec. 29, 2020. This LTC home has been hit hard by the second wave of the COVID-19 pandemic. (THE CANADIAN PRESS/Nathan Denette)

Enabling better aging: The 4 things seniors need, and the 4 things that need to change

Canadians are living longer, but are they living well? The challenges to aging well go beyond the problems in long-term care. Substantial change to Canada’s support service systems is long overdue.
Hallways busy with COVID-19 patients have become temporary patient holding areas in overcrowded hospitals. Francine Orr / Los Angeles Times via Getty Images

COVID-19 crisis in Los Angeles: Why activating ‘crisis standards of care’ is crucial for overwhelmed hospitals

States and hospitals are starting to declare ‘crisis standards of care’ as the pandemic floods their ERs. The orders have consequences – both good and bad, as a medical ethicist explains.
The first COVID-19 vaccines arrive packed in dry ice and need special freezers that can keep them extremely cold. AP Photo/David Goldman

Getting COVID-19 vaccines to rural Americans is harder than it looks – but there are ways to lift the barriers

The vaccines’ cold storage requirements and shipment rules put small, rural communities at a disadvantage, but that’s only part of a long-running challenge.
Sampling wildfire smoke sometimes means sticking a tube out the window of an airplane. Brett Palm/University of Washington

Wildfire smoke changes dramatically as it ages, and that matters for downwind air quality – here’s what we learned flying through smoke plumes

Thousands of chemical compounds in wildfire smoke are interacting with each other and sunlight as the smoke travels. For people downwind, it can become more toxic over time.

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