. >> brown: and special correspondent anna rau of montana pbs talks to patients and doctors about medical marijuana's effectiveness. >> i often suggest to my patients that they consider marijuana for their loss of appetite, nausea, pain, depression, and insomnia. one medicine they can use instead of five. >> brown: that's all ahead on tonight's newshour. major funding for the pbs newshour has been provided by: >> okay, listen. somebody has got to get serious. >> i think... >> we need renewable energy. >> ...renewable energy is vital to our planet. >> you hear about alternatives, right? wind, solar, algae. >> i think it's got to work on a big scale. and i think it's got to be affordable. >> so, where are they? >> it has to work in the real world. at chevron, we're investing millions in solar and biofuel technology to make it work. >> we've got to get on this now. >> right now. ♪ ♪ ♪ ♪ ♪ ♪ >> moving our economy for 160 years. bnsf, the engine that connects us. the william and flora hewlett foundation, working to solve social and environmental problems at home and around the world. >> and wi