Robert S. EshelmanSeeker Gobi Desert Dust Helps Sustain California's Sierra Nevada Climate change is expected to increase the amount of dust migrating in the atmosphere, which could have a significant nutritional impact on mountain ecosystems like the Sierra Nevada. Mammals Shrank During Ancient Global Warming Event Significant dwarfing in mammals occurred about 53 million years ago due to dramatic shifts in climate. Could that happen today? By Robert S. Eshelman Published 17 March 17