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Social distancing when necessary in these visits. but there is scrutiny on the extent of his travel in the run—up to cop as i'm sure there will be of all areas of government policy as that crucial summit looms and the government's ambitions for it and its approach to climate change in general come under increasing scrutiny. general come under increasing scrutin. ., ., general come under increasing scrutin . ., ,, general come under increasing scrutin. ., . it's long been feared that one of the most catestrophic results of climate change could be the collapse of the gulf stream. the atlantic ...

Be possible that covid-19 could spread through the air more easily than we knew. >> we acknowledge that there is emerging evidence in this field. >> reporter: 239 scientists from 32 countries put pressure on the w.h.o. to change its current guidance. we have long known that the virus can spread, as you see in this video, by large droplets that are only in the air for minutes. those droplets can come from coughs or sneezes or even talking loudly, singing or heavy breathing. these scientists now say this virus may be able to stay in the air much longer, in much smaller, tiny aerosolized particle...

Debris. that debris is dangerous. stay away from it. stay -- if you're in a safe place, stay there. if you need help, search and rescue teams will be there as soon as they possibly can be. >> daniel canuski, thank you. we appreciate it. >> thank you. let's turn to the director of the national weather service with us right now. it's pretty awful situation. we've never seen anything like this, a hurricane, natural a category 5, hit the panhandle of florida. >> and do it in october. which is another unique aspect of this. we haven't had a land falling category 4 storm anywhere in the united sta...

Going to have tremendous tree damage. that's a very dangerous situation, whether you're driving, whether you're in your house. so it's -- this story isn't over yet in terms of the impact that this storm is going to have. and, of course, we're going to get heavy rains, but with the fast-moving storms, it isn't going to be like what we saw with florence, but still 4 to 6 inches of rain in a very short period of time creates a moderate risk for flash floods. so we have that to be working with, as well. >> we know the damage is going to be devastating in florida and georgia, going up to the caroli...

What can you tell us? >> this is a vein that drains blood from the brain into the central circulation system. the danger with it, because it's so close to the brain, is that if the clot were to grow, it could go inside the brain and become a stroke. that didn't happen according to the doctors. it's appropriate to treat this kind of clot with anti-coagulant therapy. one of the things everybody was talking about before was usually when somebody has a concussion, they get a blood clot called a subdural hematoma and that cannot be treated with that therapy because it presents certain dangers. beca...