Throughout the U.S., trees are dying at an astonishing rate. The reasons for the die-off vary from location to location — drought, disease, insects and wildfires – but the root cause in many of these cases is the same: climate change.The epidemic is even threatening the oldest white oak tree in America, a 600-year-old giant in New Jersey that predates Columbus’ visit to the Americas.

When you go out for sushi or visit a seafood restaurant, how sure can you be that you’re really getting what you’ve ordered? Last week, Oceana released some shocking findings: Around the world, an average of one in five samples of seafood is mislabeled.The report examined 25,000 samples worldwide and reviewed more than 200 published studies from 55 different countries. Every continent was represented apart from Antarctica. The mislabeling was present in every part of the seafood supply chain, including retail, wholesale, distribution, import/export, packaging, processing, and landing.That’s bad news for many reasons – mislabeling makes dining dangerous for consumers (not all of these species are considered suitable for human consumption), and difficult for people who are trying to avoid mercury exposure or who simply want to dine more sustainably. In most cases, cheap fish were being passed off as more expensive varieties.

A new study from Lancaster University has discovered toxic nanoparticles from air pollution in large quantities in human brains. The researchers examined brain tissue from 37 people aged between 3 and 92 years old in the U.K. and Mexico. Magnetite, a type of iron oxide, was found in massive quantities in the samples – millions of particles per gram of brain tissue.

For years, one of the major arguments that has been made against genetically engineered crops is the fear that, by tampering with a plant’s DNA, it could potentially cause health issues for consumers. It’s an understandable worry, however, the scientific consensus now seems to be undeniable: Whatever faults GMO crops may have, they are safe for human consumption.