Who have recently tried to put price tage on nature's life support services ?

Robert constanza and his calleagues have very recently tried to put price tags on nature's life support services. They have part an average price tag of one year is :-

Rober Costanza and his colleagues have tried to put price tags on nature's life support servies . Ecosystem servies are largely taken for granted. According to this concept the most valuable ecosystem service is ( w.r.t. price ) :

What is the amount of average price tag on nature's life support services determined by Robert Constanza and his colegues?