内容摘要：and prune when their plants have grown to half their expected seasonal height, whenever that may be. (The Chelsea Chop is done at different times in different places, depending on plant emergence and growth.)

and prune when their plants have grown to half their expected seasonal height, whenever that may be. (The Chelsea Chop is done at different times in different places, depending on plant emergence and growth.)

, developing sites to, which naturally store CO2. But many of those projects are limited by space and could impact nearby communities. The ocean already regulates Earth’s climate by absorbing heat and carbon, and by comparison, it seems limitless.

“Is that huge surface area an option to help us deal with and mitigate the worst effects of climate change?” asked Adam Subhas, who is leading a carbon removal project with the Woods Hole Oceanographic Institution, based on Cape Cod, Massachusetts.Adam Subhas, right, a scientist with the Woods Hole Oceanographic Institution, speaks about an ocean carbon project at the Massachusetts Lobstermen’s Association Annual Weekend and Trade Show, Friday, Jan. 31, 2025, in Hyannis, Mass. (AP Photo/David Goldman)Adam Subhas, right, a scientist with the Woods Hole Oceanographic Institution, speaks about an ocean carbon project at the Massachusetts Lobstermen’s Association Annual Weekend and Trade Show, Friday, Jan. 31, 2025, in Hyannis, Mass. (AP Photo/David Goldman)

On a Tuesday afternoon along the edge of Halifax Harbour, Burt stashed his bike helmet and donned a hard hat to give two engineering students a tour of Planetary’s site.A detached truck trailer sat in a clearing, storing massive bags of magnesium oxide mined in Spain and shipped across the Atlantic to Canada.

Most companies looking offshore for climate solutions are trying to reduce or transform the carbon dioxide stored in the ocean. If they can achieve that, Burt said, the oceans will act “like a vacuum” to absorb more gases from the air.

Planetary is using magnesium oxide to create that vacuum. When dissolved into seawater, it transforms carbon dioxide from a gas to stable molecules that won’t interact with the atmosphere for thousands of years. Limestone, olivine and other alkaline rocks have the same effect.National Oceanic Atmospheric Administration, Juneau, Alaska (1,595 square feet)

Agricultural Marketing Service, Los Angeles, Calif. (1,527 square feet)United States Fish and Wildlife Service, Madison, Wis. (2,871 square feet)

Railroad Retirement Board, Mesa, Ariz. (1,946 square feet)Farm Service Agency - County, Monticello, Utah (4,233 square feet)