Kelp, a kind of seaweed, can be used in biofuels that one day could power ships and aircraft. That would sharply reduce the use of gas and oil, which emit greenhouse gases that lead to global warming.
The phrase “cash is king” may not have the same ring as it used to, now that more than 40% of Americans, per the Pew Research Center, regularly go a week or more without paying for anything using ...
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