This story was originally published by the Guardian and is reproduced here as part of the Climate Desk collaboration. In April, at the TED conference in Vancouver, BC, I watched a woman pull a variety of mushroom powders from her purse, scoop them into a thermos, and add hot water from a nearby tea station to make an earthy beverage. Intrigued, I asked about her favorite health practices, and she started describing a recent trip to Costa Rica to get plasmapheresis.