Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Richard Feely, R. Wanninkhof, T. Takahashi, and P. Tans
(1999). "Influences of El Nino on the equatorial Pacific contribution to atmospheric CO2 accumulation." Nature, 398, 597-601. Gonzalez, F. (1999). "Tsunami." Scientific American, 280, 56-65.
