The analysis comes as forecasters predict a fierce 2020 Atlantic hurricane season, which officially starts June 1.
Weakened to a Category 1 hurricane, the powerful storm lashed communities with wind, rain and floodwaters.
Researchers call for emergency protections as 400 remaining animals fight for their lives.
Storms last year caused $50 billion in damage.
Frenchman Jean-Jacques Savin aims to complete the trip inside the specially constructed barrel capsule in 3 months.
A giant deep-sea reef off South Carolina has deepened environmentalists' concerns about a planned hunt for oil and gas reserves.
“I know we’re going to find something that no one’s ever seen before,” said the expedition’s chief scientist.
"The long-term warming trend driven by human activities continued unabated," researchers said.
“I don’t mind opening up drilling if states can opt out," Sen. Lindsey Graham (R-S.C.) said.
“It just takes a small amount of ice to make roads and sidewalks a skating rink,” a meteorologist warned.