Public Lectures

To improve societal and environmental wellbeing, decision makers need climate information that is actionable. Actionable climate information needs to be timely; sufficiently detailed as to describe the region and processes of interest; trustworthy and truthful in acknowledging uncertainties; and policy- or decision-relevant. We have already begun to observe the transformative power of machine learning (ML) to produce actionable knowledge in weather forecasting (where we can conveniently check whether our predictions are correct). How could machine learning do the same, and more, in the context of climate change? This talk will introduce how we make climate predictions, and then describe ways in which machine learning can enable us to make more trustworthy and more detailed climate predictions, at a faster pace. We'll also explore how machine learning can provide a bridge between climate.

Today, about 3000 glaciers straddle the Equator in Latin America, East Africa, and Indonesia. Dr. Heïdi Sevestre will present her ongoing project, “The Last Tropical Glaciers,” initiated in 2019 in Colombia. Together with local glaciologist Jorge Luis Leballos and citizen science project Cumbres Blancas Colombia, they conducted several field campaigns to support the monitoring of the small tropical glaciers in the country and raise awareness of these rapidly disappearing glaciers all the way to the desk of decision makers. Today, about 3000 glaciers straddle the Equator in Latin America, East Africa, and Indonesia. Dr. Heïdi Sevestre will present her ongoing project, “The Last Tropical Glaciers,” initiated in 2019 in Colombia. Together with local glaciologist Jorge Luis Leballos and citizen science project Cumbres Blancas Colombia, they conducted several field campaigns to support the monitoring of the small tropical glaciers in the country and raise awareness of these rapidly disappearing glaciers all the way to the desk of decision makers.

The Colorado River is critically important--it supplies water to over 40 million people, irrigates over 5 million acres of agriculture, and supports hydropower, environmental, and recreational resources. The Colorado River Basin is also incredibly complex--it spans seven U.S. states and two Mexican states, has highly variable hydrology, and is overallocated. Long-term planning in the Colorado River Basin has always been challenging due to uncertainties in hydrology, demand, policy, and different management priorities among stakeholders. These challenges are now exacerbated by the need to account for potential impacts of climate change. This context is best described as deep uncertainty, where a wide range of assumptions about future conditions are plausible, multiple management perspectives are expressed, and it is impossible to identify the best assumptions about conditions or priorities.

This talk presents studies conducted by Bureau of Reclamation's Colorado River Basin Modeling and Research Team that demonstrate uncertainty in climate and hydrology and explore Decision Making under Deep Uncertainty (DMDU) techniques to help address planning challenges.

Urban heat is deadlier than nearly all other U.S. weather-related hazards combined, with risks increasing due to climate change and the urban heat island effect. During this summer's record-breaking temperatures, urban heat is at the forefront of the national conversation on climate risk, intersecting with and compounding the COVID-19 pandemic, social inequity, and racial injustice. Fundamental research continues to advance understanding of the characteristics of resilient cities and their governance, but translating this knowledge about urban resilience into practice remains a challenge.

Three quarters of ice-free land surface is managed for human use -- cleared for agriculture, grazed on, or used for forestry. This land use has accounted for one third of historical anthropogenic CO2 emissions globally, but it also affects climate locally by changing water and energy fluxes. Depending on type of land use change and where it takes place, the effect may be a warming or a cooling contribution to overall global climate. Whether land use change has a warming or cooling contribution to global climate change is crucially important. An improved understanding of the interplay between land use and climate can transform our thinking about how land management can serve as a mitigation strategy to curb climate change. In particular, land use choices such as afforestation, bioenergy production, and other options will likely play a prominent role in preventing the global climate from surpassing the 2-degree target of warming. This talk will illustrate different perspectives on past and future land use, considering impacts of both carbon and biogeophysical variables at local and global scales.

A major goal for food and agricultural research is to increase the resiliency of agricultural systems to adapt to rapid changes and extreme conditions. In this free public lecture hosted by the Aspen Global Change Institute, Dr. Pam Ronald (UC Davis) will describe how genetic approaches are being used to generate the next generation of crops that will help farmers thrive in these challenging conditions. This lecture is part of AGCI's Walter Orr Robert Public Lecture Series.