action summit are uc berkeley energy professor daniel cammen and san fncisco chronicle reporter curtis alexanderwelcome to you both. curtis, you have been covering the climate change summit. what do you think it accomplished this week? >> well, the climamm change was not the paris conference that the world held three years ago, so it wasn't national leaders coming to the tab to agree on a landmark deal to cut greenhouse gas emissions. what it was abou was cities, states, and businesses and other regionaly actors rea getting together to figure out what they could do to try help the national efforts to reduce greenhouse gasem ssions. i think they talked a lot about kind of what they're doing. they showcased their efforts, and i think they're going to go home with a lot of knowledge on what they can do better to try to help reduce greenhouse gases. >> so a bottom-up approach? is that effect, dan? >> it is. in fact, we've seen especially now with really challenging politics in washing tn, d.c. this subnational approach, so-called under two u, the under two degree coalition. now it's up to 220-some m

curtis alexander with the san francisco chronical and dan kammen, uc berkeley energy professor, thankso you both. >> thank you. >> thank you. >>> let's turnti our att now to cannabis. this week the associated press reported that nearly 20% of california marijuana products failed potency and purity tests. the primary culprit, mislabeling of a product's concentration of thc. that's the chemical com pound in marijuana that gets a person high. testing show that thc amounts did not fall within 10% of what the product labels advertid. meanwhile, california is wrapping up its efforts to track and trace cannabis, to monitor its movement through the supply chain from farms to dispensaries. take a closer look are david downs, california bureau chief for lely.com, and josh drayton,om spokfrom drayton. josh, you're with the trade group for the cannabis dustry. what is your reaction to the finding that nearly 20% of california's marijuana products fail tests for potency and purity? >> i would say i'm not surprised. this is an issue that our association has identified months back. thinkowing the man

we talked to curtis alexander from "the chronicle" and after he listened to debby and he listened to robbie haley and talked to us about our commitment, we wound up with i think a front-page story in "the chronicle" and that was our first kind of splash about the global climate summit and some of the policy commitments that the staff had put together. so we called that a success. so that was our first controlled, civilized splash. and the sequel to that was our action-packed, like blockbuster sequel, i should say. that was our press event at the mosconi center that i know some of you were at and i know that commissioner hoyos was there and commissioner ahn was there and commissioner bermejo was there as well. and at that press event, there were so many things announced that i have to read it off. we recapped our zero waste commitment and we announced our initiative to decarbonize our buildings and to make them net zero buildings and we announced the green bonds commitment and the new solar ray going up at the mosconi center that provided a nice back drop for our commitments. and the