abrahm: yes, that's right. mean, everything about climate change's impacts are unequal in a way. and so you see disproportionate impacts in the most vulnerable parts of the country. some of the economic forecasts that i have been looking apt predict that that gdp impact might be as high as 20 or 25% for counties in the southern part of the country, along the gulf coast in particular. some of those impacts to crop fields that economists are looking at, they reach 70%, 90% in places in counties in texas and oklahoma. so, there might be some economic growth or opportunity in the northern part of the country, but in the southern part of the country and in the southwest and the gulf coast in particular, those economic impacts are going to be very substantial. william: and, i mean, these numbers are sort of astronomical, and they, in some ways, offer a real context for the numbers that are being debated here in washington, d.c. what do we know about whether the elements and the actions that are being considered here

abrahm, great to have you back on the newshour. when seone says to you, what, do you mean by the cost of inaction?" what are you actually talking about? >> everything about what climate change is going to do to the world and to our soapt is going to cost us money and impact our economy. it's going to inflict incredible storms, which have a great cost of cleanup. it's going to change the value of real estate. it'soing to change the way we grow food and how much food we can grow d the farm economythat surround. and it's going to change how productive labor is. so it really gets to the bedrock of everything that drives our economic activity. economists will i speak with estimate that climate change unabapted could cost the u.s. 10% of its g.d.p. climate change slightly abated, sort of a middle path, could cost the u.s. 4% of its g.d.p., which is $840 billion a year, if you count that against today's economy. >> brangham: so you mentioned some of the ways in which climate change runs up these incredible bills. what are some of the othe