Billions of sea creatures perished in Northern Hemisphere heatwaves

Experts say billions of mussels, starfish and clams died in soaring coastal temperatures while heat, fires and smoke impacted animals on land. The heatwaves across the Pacific Northwest in late June and early July weren't just deadly for humans, they also had an unprecedented impact on animals both on land and at sea.  With temperatures at an all-time high of 112 F (44.4 C) in places such as Portland, Oregon and 107 F (42 C) in British Columbia, more than one billion ocean species are believed to have died off…