WATCH: The latest evidence of widespread sperm count decline

"Pregnant women, and men planning to conceive a pregnancy, have a responsibility to protect the reproductive health of the offspring they are creating."

Dr. Shanna Swan, a leading reproductive epidemiologist at Mount Sinai and adjunct scientist with Environmental Health Sciences, discusses a new analysis that found that sperm count globally dropped by more than half between 1973 and 2018, and that the decline is accelerating.


Dr. Swan, a coauthor of the new analysis published in the Human Reproduction Update journal, outlines the implications of this infertility crisis and some of the environmental causes. Swan authored the book Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race.

Watch the video above for Dr. Swan's thoughts on the latest findings, and read about the report here.

Burned hillside with mountains in the background

How wildfires threaten B.C.’s drinking water

Communities from Cranbrook to Kelowna know fire can contaminate reservoirs as well as burn homes. Experts say protecting watersheds must become as urgent as protecting schools or hospitals.

A satellite view of the gulf of mexico and the gulf of panama

Ocean current fails for first time in decades, prompting concern

The failure of the Gulf of Panama’s seasonal upwelling system has left scientists wondering what happens next.
A deforested area with a cow walking across the grass

More deforestation leads to a drier dry season, Amazon study finds

In Brazil’s southern Amazonian region, where the notorious “arc of deforestation” has been expanding since the 1970s, forest loss is reshaping the region’s atmospheric water cycle.

Two hands holding a model of a house in their hands

How climate risks are putting home insurance out of reach

As climate-fueled hurricanes, floods, and wildfires grow more destructive, the U.S. home insurance industry is collapsing in high-risk regions.

Reno street with casino at sunset

Extreme heat takes toll on Nevadans' health, pocketbooks

As rising temperatures drive up utility bills and heat-related illnesses, Nevada residents face growing health dangers and economic hardships, prompting lawmakers and advocates to push for stronger protections and sustainable solutions.

A factory or power plant with smokestacks emitting pollution

Trump's EPA plans to stop making companies report their emissions

The EPA has proposed rescinding its long-standing greenhouse gas reporting program, which tracks emissions from thousands of facilities nationwide. Critics warn the move would blind policymakers, states, and the public to the true scale of climate pollution.

A river flowing between dry rocky bluffs

Experts warn Colorado River crisis demands immediate water cuts across the West

With reservoirs at less than one-third capacity, researchers say the Colorado River could reach dangerously low levels after another dry winter unless the federal government and seven Western states act quickly to reduce water use.

From our Newsroom
Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

One facility has emitted cancer-causing chemicals into waterways at levels up to 520% higher than legal limits.

Regulators are underestimating health impacts from air pollution: Study

Regulators are underestimating health impacts from air pollution: Study

"The reality is, we are not exposed to one chemical at a time.”

Pennsylvania governor Josh Shapiro speaks with the state flag and American flag behind him.

Two years into his term, has Gov. Shapiro kept his promises to regulate Pennsylvania’s fracking industry?

A new report assesses the administration’s progress and makes new recommendations

silhouette of people holding hands by a lake at sunset

An open letter from EPA staff to the American public

“We cannot stand by and allow this to happen. We need to hold this administration accountable.”

wildfire retardants being sprayed by plane

New evidence links heavy metal pollution with wildfire retardants

“The chemical black box” that blankets wildfire-impacted areas is increasingly under scrutiny.

Stay informed: sign up for The Daily Climate newsletter
Top news on climate impacts, solutions, politics, drivers. Delivered to your inbox week days.