before i turn to senator alexander i wanted to respond to senator cortez musto.a very direct question of me. know that i do understand the importance of this issue to you, your delegation and your constituency. i want to be very clear that i'm very open to working on this bill with you, with senator mansion, any other senators interested. in working on it. senator alexander, senator feinstein and i introduced this bill understanding that changes are going to be needed to bring it in line with current policies. i am aware of the language you have offered along with senator rosen and senator mansion. and that you believe it could improve the bill. know that i look forward to discussing this language with you as we are moving forward. i think we all want to find that practical path forward. i look forward to that. let me turn to senator alexander. >> thank you madam chairman and thanks to the witnesses. me see if i can get into what the i think is the crux of the problem. we got a little concerned about climate change, and the effect of comet emissions on climate ch