www.scientificamerican.com
A controversial geoengineering proposal suggests that brightening clouds off South America could weaken a burgeoning El Niño, but major technical and ethical questions remain.
PMEL Personnel
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.