No, not the one oozing out of the intertubes . . .

Algae, not asteroids, were the key to the end of the dinosaurs, say two Clemson University researchers. Geologist James W. Castle and ecotoxicologist John H. Rodgers have published findings that toxin producing algae were a deadly factor in mass extinctions millions of years ago. The research not only provides new insights into the past but also offers a caution about the future. The scientists say that current environmental conditions show significant similarity to times when previous mass extinctions occurred. . .

He and Rodgers have spent two years analyzing data from ancient algal deposits — stromatolite structures — finding evidence that blue-green algae, which produce poisons and deplete oxygen, were present in sufficient quantities to kill off untold numbers of plants and animals living on land or in the sea. . .

The previous post mentioned research about the Eemian period just 130,000 years ago when temperatures were 5 to 9 degrees Fahrenheit warmer than today. No mass extinctions then. I suspect that the threat of some sort of microscopic plague is plausible, but doubt that it can be linked to current climate issues except for funding purposes. Politics can link anything to anything, it's a super-solvent and a super-glue, the ultimate cognitive multi-tool even more powerful than religion since one doesn't have to believe in anything.