Access options
Access Nature and 54 other Nature Portfolio journals
Get Nature+, our best-value online-access subscription
$29.99 / 30 days
cancel any time
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Rent or buy this article
Prices vary by article type
from$1.95
to$39.95
Prices may be subject to local taxes which are calculated during checkout
doi: https://doi.org/10.1038/d41586-019-03818-4
Additional reporting by Nidhi Subbaraman.
Updates & Corrections
-
Update 11 December 2019: Added comments from a Department of Energy spokesperson, Michael Lauer and Stephen Pei.