they are substances that are released, go up into the statosphere, eat up the ozone and that then creates additional ultraviolet rays which -- >> they have local effects. everybody knows -- that's smog in los angeles versus montana, right? >> certainly greenhouse gases have those kind of local effects because they raise the sea level which causes flooding in certain places and droughts in other places. >> whether have the sea levels risen other than please in >> well, certainly massachusetts. but e.p.a. has been regulating ozone-depleting sub stances since 1988. >> and congress aki he ised in that? i think in 1990 they raltfied it. one thing they did was specifically focus on ozone-depleting substance -- substances and they did not pull ozone-depleting substances out of the p.s.d. program and that's significant because they did -- >> i thought there was a very short time lag between e.p.a.'s assertion of the authority to regulate ozone-depleting substances -- >> years. i don't know if it was a full two years but the congress focused specifically on exactly lou the ozone-depleting substanc

they are substances that are released, go up into the statosphere, eat up the ozone and that then creates additional ultraviolet rays which -- >> they have local effects. everybody knows -- that's smog in los angeles versus montana, right? >> certainly greenhouse gases have those kind of local effects because they raise the sea level which causes flooding in certain places and droughts in other places. >> whether have the sea levels risen other than please in >> well, certainly massachusetts. but e.p.a. has been regulating ozone-depleting sub stances since 1988. >> and congress aki he ised in that? raltfied 1990 they it. one thing they did was pecifically focus on ozone-depleting substance -- substances and they did not pull ozone-depleting substances out of the p.s.d. program and that's significant because they did -- >> i thought there was a very short time lag between e.p.a.'s assertion of the authority to regular late ozone-depleting substances -- >> years. i don't know if it was a full two years but the congress focused specifically on exactly lou the ozone-depleting substances were