To mark Earth Day’s 50th anniversary, amid the coronavirus pandemic, the Gazette contacted experts on climate change, the environment, and sustainability to ask them about their global-warming fears. Here are their answers.

While considerable resources are invested in seasonal forecasts and early-warning systems for food security, not enough is known about El Niño’s impact on the fisheries and aquaculture sectors, even though its name was given in the 1600s by fishers off the coast of Peru. 

Climate change and warming seas are transforming tropical coral reefs and undoing decades of knowledge about how to protect these delicate and vital ecosystems.

Geography and a prolonged period of wet weather have made flooding common on this river in the Northern Plains.

Nitrogen makes up approximately 78% of the air we breathe. But scientists have never fully understood how it came to be present in the atmospheres around Earth and other planets.

Forestation is one of the main strategies recommended by the scientific community for climate change mitigation.

A new study shows that “hotspots” of nutrients surrounding phytoplankton — which are tiny marine algae producing approximately half of the oxygen we breathe every day — play an outsized role in the release of a gas involved in cloud formation and climate regulation.

At the Delaware Memorial Bridge, about 35 miles southwest of Philadelphia, the tidal waters of the Delaware River estuary push upstream with every incoming tide but are opposed by the river’s downstream flow. 

A new study shows that plant materials originating in Arctic sea ice are significantly incorporated into marine food webs that are used for subsistence in local communities of the greater Bering Strait region. 

Hurricanes moving slowly over an area can cause more damage than faster-moving storms, because the longer a storm lingers, the more time it has to pound an area with storm winds and drop huge volumes of rain, leading to flooding.