host: zack colman? guest: i think david brought up good points. one of the 2020 candidates, cory reforestation is one of his signature aims. i think there is definitely a point about transportation here. we don't have the ability to get a handle on climate change if we are not using editions from transportation. people are beholden to their cars at this point. it is a big challenge. that is where most emissions come from, not the power sector or electricity. that is something all candidates are wrestling with. host: you mentioned reforestation. president trump is looking to boost logging in alaska. that we need sense more trees to capture more carbon, any tree lost is going to be negative for the climate. guest: the story in the washington post looking at president trump the perley asking sonny perdue to exempt million acres that was imposed 20 years ago. something that may be in the works. bridget out of austin, texas. caller: how are you? thank you for both of your work. i wanted to mention john robbins work. out about food revolution. watere 50

host: zack colman with us for about five more minutes. harrison, democrat. caller: i want to see if i can get zack to expound on the idea andorn and ethanol, especially in our primary politics. it is just my opinion that the ethanol mandate in our gasoline is a bad idea. i think it is getting proven out. my brother and i were discussing this yesterday. i looked up corn production and how much of it goes to ethanol. these are not exact numbers but it was about 20 billion bushels of corn and a little over 5 billion that was ethanol production. in general we know that social security is the third rail of politics. i wondering if this bad policy of use of corn with ethanol is the third rail of primary politics. ethanol has been entered honestly divisive topic. when we talk about agriculture, climate and agriculture. the groups have shown amount of corn used for ethanol has led to land-use change to the fact we have fewer trees and have to clear it corn for ethanol. and for fee for livestock. and this is something that is a huge environmental issue. there are peop

host: zack colman with us for about five more minutes. harrison, democrat. want to see if i can get zack to expound on the idea andorn and ethanol, especially in our primary politics. it is just my opinion that the ethanol mandate in our gasoline is a bad idea. i think it is getting proven out. my brother and i were discussing this yesterday. i looked up corn production and how much of it goes to ethanol. these are not exact numbers but it was about 20 billion bushels of corn and a little over 5 billion that was ethanol production. in general we know that social security is the third rail of politics. i wondering if this bad policy of use of corn with ethanol is the third rail of primary politics. ethanol has been entered honestly divisive topic. when we talk about agriculture, climate and agriculture. the groups have shown amount of corn used for ethanol has led to land-use change to the fact we have fewer trees and have to clear it corn for ethanol. and for fee for livestock. and this is something that is a huge environmental issue. there are people on both

host: political reporter zack colman is back with us as we continue our discussion of environmental issues and campaign 2020.