Past Climate Change

Existence of the park plateau is a bit of evidence for past global climate change:
Additional evidence of past climate change going back 30,000 years is provided by
sediments collected from lakes near the park. Wind-blown and rain-carried pollen
collects slowly in sediments under lakes and forms layers that serve to preserve
the history of plant life in the region. Laguna Bella Vista and Laguna Chaplin have
been studied to learn about the pollen in their sediments and to study plant life in the
surrounding terrain. Drills were used to extract sediment samples at various depths.
This region of Bolivia is at the lower edge of the warm, wet Amazon rainforest.
Further south are dry, cooler grasslands. Sediment evidence show that about 12,000
years ago, the pollen was from plants typical of dry grasslands