house shut down a major hydro electric plant at one of the states largest reservoirs. climate change is now posing a risk to california s renewable energy infrastructure. that s actually meant to help combat the crisis. our report tonight from nbc correspondent jacob. on california s lake oregon, john lopez just discovering or world not seen for decades. this is the first time this set of trees here has even seen the light of day in probably 60 years. so in your lifetime, these trees have never been above the waterline? exactly. the water level at the state s second largest reservoir is the lowest it s ever been. drops are new to this part of california, but what is different the intensity and duration of the current drug, runoff by the effects of climate change. johnny arbery helps oversee water management at lake. what happens all the water?