You think climate change is the most important/urgent/relevant thing happening. I get it. I'm not even saying you're wrong. But this is Hacker News; it's not Climate Activism Central. Climate change, no matter how relevant, is not the central topic here.
An article on the world's oceans setting record temperatures for 80 continuous days is alarming. But it was alarming at 70 days, too, and at 60, and at 50. Is there any new discussion that's going to happen on the article about 80 days that didn't happen on the article about 50 days? That's why it shouldn't be on the front page - not because climate change isn't important, but because there's nothing new about the 80-day threshold. It's just the same old bad news. (In the same way, the invasion of Ukraine is bad, and important, but we don't mark the 430th day of the invasion, and then the 440th day, and then the 450th day.)