A RACE AGAINST CLIMATE CHANGE
cousins on the tepuis
around them. As cli-
mate change and chy-
trid fungus threaten
amphibians worldwide,
herpetologist and
National Geographic
Explorer Bruce Means,
assisted by Honnold
and others, is leading
a quest to identify
new species here. The
aim: to understand
how these amphibians
have adapted to their
ecosystem, before
they disappear.In an ambitious
scientific-adventure
expedition, Alex
Honnold sets the
first course up Weias-
sipu, one of a series of
tabletop mountains
called tepuis that
rise above the jungle
at the intersection of
Guyana, Brazil, and
Venezuela. Millions
of years of erosion
created these hard-to-
reach worlds, where
species have evolved
in isolation from their
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