Entitled “ Earth and human , a planetary perspective ” , his lecture focused on the evolution of the planetary earth , and the transition of the dominant air in the atmospheric circle on earth from carbon dioxide to nitrite and oxygen .He has published over 120 peer-reviewed papers , including 7 first-authored papers in Nature . He was nominated AGU fellow in 1993 , member of American Academy of Arts and Sciences in 1997 and member of United States National Academy of Sciences in.