A new study by researchers at UC Santa Cruz and UC Santa Barbara finds that scrapping functioning gasoline vehicles and replacing them with electric vehicles reduces cumulative emissions by 44% for a typical SUV over 16 years, with 92% of modeled scenarios favoring early retirement. The manufacturing emissions of the replacement EV are typically recovered within three years through lower operating emissions, making the environmental case for early vehicle retirement considerably stronger than the "greenest car is already built" argument suggests.
A new DNA and isotopic analysis reveals that the 'American cheetah' (Miracinonyx trumani) was actually a sister species to the modern puma, not a cheetah. The Pleistocene felid exhibited remarkable dietary flexibility: northern populations adapted to eat fish like salmon while southern populations hunted terrestrial prey, and they also adapted to extreme Arctic light cycles through mutations in circadian rhythm genes.