felt sick after the first on dose. side effects that last for weeks or months after a vaccine are probably not due to the vaccine. you need to see the doctor and make sure there's not something else going on. what can cause lingering ongoing problems for many, many months is covid. >> reporter: this is an infectious disease specialist. she said people are considered unvaccinated until they have had both shots. >> in the way that the vaccine is supposed to work. the first shot is sort of like your body being told, here is a picture of a spike protein, this is what you are looking for. and you need to take care of it if you see it. and often times our bodies react the same way that we react and they say, okay, got it sounds good. and then the second shot is like a practice run. it's sort of tricking your body and says here's the spike protein again and your body jumps in to action and it does everything that it needs to do to fight off the spike protein.

and it creates a big boost in ant bodies that last longer. >> what risk is someone taking by not taking the second dose? >> not getting your second shot is like you are giving up on the immunity and you may be at risk for covid as soon as a few months after the first vaccine. and secondly you have way lower immunity to all of the variant this is that are the predominant things circulating right now. >> reporter: if none of the people get the second shot, could we regress, and not reach herd immunity and go back to square one or two? >> absolutely. this covid is not gone. >> reporter: daniel's second dose appointment is this friday, she is not sure she will go. is it going to be a game time decision? >> i will probably, in my mind tell me, tell myself, you know, you can make the decision when you wake up. that way the pressure is off of me. >> reporter: what if too many people don't get the second dose and we don't stamp out the virus? >> yeah, no, i think that is a very valid concern and i have thought about that, and thought, okay, i don't want to be a part of the problem, but i think that

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to study and develop seaweed as a sustainable food source on a warming planet. a cbs ben tracy shows it could also be a way to help trap harmful carbon emissions that are causing climate change. >> reporter: it's maine and matt is cutting through a heavy blanket of fog. what is it like driving out here on a morning like this? >> it's incredibly disorienting and hard to see. >> reporter: just as it starts to clooer, we see dozens of the colorful buoys bobbing on the water, we have arrived at his underwater farm. his crop is seaweed, the fancy name for it is kelp, we sent a camera down to see what it looks like. could you eat it right how? >> yeah. you want to try some? >> reporter: sure. >> give it a nibble, it's

delicious, cheers. >> reporter: it's pretty good, thank you for sharing your kelp. >> absolutely. >> reporter: he and 24 other seaweed farmers back in maine sell to atlanta sea farms. they turn it in to food products sold in grocery stores and increasingly restaurants at this one in maine the lobster roll is topped with seaweed pesto. how quickly is it growing here? >> the entire state of maine was 40,000 pounds two years ago and now we will harvest 850,000 pounds. >> reporter: seaweed is considered a healthy source of protein, with up to five times more calcium than milk. it's a crop that may better sustain climate change. it's on pace to be bigger than potatoes by 2051. it's not the most celebrated of plants in the ocean. >> right.

people think it's the thing that wraps around your legs when you are swimming. >> reporter: we pmet paul dobbis in the bay, that is warming faster than 99% of the world's oceans because of how shallow it is. the warmer water is causing fish species to head north and could threaten maine's main export. lobster. >> and this is a way to create a veg taibl and a protein source that doesn't require the fresh water. on or the land or fertilizer. which is really kind of miraculous. >> this is our sea water facility. >> reporter: scientists think seaweed has more to offer. it may be having a moment? >> yeah. i would say seaweed is having a moment, yeah. >> reporter: early results from the team's experiments show seaweed farms are improving water quality, and absorb one of the main greenhouse gases warming olat.

spong for carbon dioxide. >> reporter: our farms factories pump carbon dioxide in the air. scientists already know that seagrass and mangroves absorb carbon better than the world's rop cal rain forest -- tropicals do. when they burn, they pump it all back in the air. >> sothis is a hope that the seaweed can take what we give it in terms of carbon a dioxide. >> it's a hedge against aun certain future. >> we are heavily dependamt on one resource. if there's a turn in the fishery, there needs to be something else and right now, can kelp is one of those things. >> reporter: it's one of the things that is so much more than

stuff tangled around our feet. ben tracy off the coast of maine. >> a pro soccer team in england is leading the way and going green, on and off the field. the minor league club was down on its luck until a new owner started to focus on a different kind of goal. here is cbs' mark phillips. game we call soccer but the e - brits who invented it understandably changed much in years. but in a minor league team a couple of hours west of london, soccer, sorry, football is being reinvented they are the first vegen, carbon neutral professional sports team. and they got here because they were so bad. >> they were not winning or making money. >> yeah. >> they were about to go under

when dale vince when a owner of a company stepped in to save them. did you have the big idea then that you would take this long established club that was in financial difficulty and not just rescue it but turn it in to what it's become this ideal? >> no, all of that kind of grew organically, it was without any thought other than saving the club and anything else was apparent. one thing at a time. >> reporter: the first thing that became apparent was that vince a long time vegan, found himself not only in the sports . you owned a team that fed its players meat. >> yes. >> reporter: the did it horrify you? >> yes. >> reporter: they stopped serving it to the players and the fans when there were fans before covid. and a funny thing happened, everyone liked the food. former carnivor players said it improved their game.

what are the benefits? >> faster recovery times. before games you feel you have way more energy. >> reporter: really? >> yeah, yeah, yeah. >> reporter: then another funny thing happened. the team started winning. they are now fighting to move up in to a higher sdwer division o english league system. being vegan is one thing, how do you make forest green really green? not that hard. the club now powers its a park with wind turbines and solar panels and it plays on an organic field. no chemical fertilizers here, just seaweed. even the water they use is collective and used again. but still, how do you go carbon neutral? you are inthe sports business. go to away games your fans travel. all the stuff eats up energy. >> you have to measure your carbon footprint and do what you can do reduce it and then what you have left that you cannot reduce, you offset by a scheme that absorbs carbon in some other way. >> so, the field is organic, the

players are vegans, the power i? the uniforms. right now, they are bamboo, but next year's, they are going to be made out of used coffee grounds. seriously. and the next step, a new stadium built not of carbon hungry steal or concrete, but on out of wood. question you keep coming back to is why are you trying to create an example here. is it just part of your own personal approach to life that you want to run a business this way? >> do you know what? it's very -- >> that you happen to have a football club, soccer, you call it and you have to turn in to and run it the way you want to run. >> yeah, i run everything the way iano run. >> i'm mark phillips at for on estimate green rovers. >> the "cbs overnight news" will be right back.

when you humble yourself under the mighty hand of god, in due time he will exalt you. hi, i'm joel osteen. i'm excited about being with you every week. i hope you'll tune in. you'll be inspired, you'll be encouraged. i'm looking forward to seeing you right here. you are fully loaded and completely equipped for the race that's been designed for you.

a british auction house has wheeled in a prize piece of history from princess diana, we report from london. >> reporter: this 1970s traveler is not just any old bike.

this was princess s bike that she rode to work every day. >> reporter: diana spencer was 18 at the time, hounded by press e began dating prince charles. the media dubbed her motorcycle the shameal p aides called it unsuitable for a royal to be. >> shocking, they thought royalty should be riding in carriages. >> reporter: so she sold it before herwedding in 1981. >> this was the last link to her freed dome before she was put in a guilded cage. >> reporter: 40 years later, they are selling it again and it's expected to fetch a king's ransom, about $30,000, with popularity of the crown, does it add to it? >> it's so hot now. anything to do with royalty.

>> reporter: do you think they will buy it to ride it? >> that could be sacriledge. >> reporter: it has three gears and decades of royalty history. bidding begins april 28th. ian news, london. and that's the "cbs overnight news" for this wednesday. for some of you the news continues, for everybody else, check back later for cbs this morning and any time you can follow us online, at cbs news.com. report religion from the nation's capitol.

it's wednesday, april 28th, 2021. this is the "cbs morning news." the president's speech. mr. biden will address a joint session of congress for the first time. what to expect and how it will look different in the covid era. civil rights investigation. the fbi is now looking into andrew brown jr.'s death as a private autopsy sheds light on his encounter with sheriff's deputies. vaccine controversy. why one school is telling teachers and staff not to get inoculated. good morning. good to be with you. i'm anne-marie green. president biden will deliver his first address to a joint session