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For years, scientist and others concerned about climate change have been talking about the need ...

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has been died    has dead    has died    has been dead  
made for    took off    set out    turned up  
made for  set out  took off  turned up  
made for    set out    took off    turned up  
surviving  survived  to survive  having survived  
referent  expert  legitimate  reward  
referent  expert  legitimate  reward  
has worked    worked    had worked    works  
made for    set out    took off    turned up  
As he is a scientist   A.scientist as he is    Scientist as he is    As is he a scientist  
buried  being buried   having buried  having been buried  
was    has been    have been    has  
worked    works    is working    has been working  
Newton became the best known scientist.  his corpuscular theory of light was accepted.  scientists would believe in Newton only.  most people have supposed Newton till now.  
has worked    worked    had worked    works  

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