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A Random Walk in Science
I will discuss my random walk in science, from my graduate student on postdoctoral years testing the Weinberg-Salam-Glashow theory of electro-weak forces, and then to energy transfer in condensed matter systems, the spectroscopy of positronium, laser....
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What Future for Energy and Climate?
We are using the planet's fossil fuel resources in a time which is very short compared to that of human evolution. In the same process we are changing the planet's climate and sea level, threatening the future of large segments of the global populat....
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Canoeing in the Arctic, a Scientist’s Perspective
As scientists, our livelihoods are supported by teaching and research, but we also have the opportunity to make observations beyond our usual confines and share these with non-scientific citizens. Growing up in my native state of Minnesota, I have al....
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Atmosphere Climate and Chemistry in the Anthropocene
Despite their relatively small mass, 10-5% of the earth biosphere as a whole, generations of ambitious 'homo sapiens' have already played a major and increasing role in changing basic properties of the atmosphere and the earth's surface. Human activ....
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Greenhouse Gases and Climate Change
The 'greenhouse gases (GHG)' intercept a fraction of outgoing terrestrial infrared radiation, creating the natural greenhouse effect which warmed the atmosphere by approximately 32 Celsius at the beginning of the 20th Century. The activities of manki....
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Atmospheric Chemistry and Climate in the Anthropocene
Despite their relatively small mass, 10% of the earth biosphere as a whole, generations of ambitious ‘homo sapiens’ have already played a major and increasing role in changing basic properties of the atmosphere and the earth’s surface. Human ....
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The Science and Policy of Climate Change
Climate change is the most serious environmental challenge facing society in the 21st century. The basic science is clear: the International Panel on Climate Change concluded that there is more than 90% probability that human activities are causing....
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Communicating Climate Change Science
Climate change represents one of the most serious challenges that society is facing in this century. It is important for humanity to limit its interference with the climate system by profoundly modifying activities such as burning fossil fuels and ....
More details | Watch nowThe Energy and Climate Change Challenges and Opportunities
Science and technology has profoundly transformed the world. After giving a few historical examples, beginning with the industrial revolution, I will discuss the challenges, opportunities and necessity for the world to transition to a sustainable e....
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Powering the Future
Some seeds of what to do in the climate/energy controversy are contained in what will be. In this talk I shall ask everyone to jump over contemporary politics and make a mental journey to a time, several centuries from now, when nobody uses carbon-....
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Science not stamp collecting? Botany from 1759 to 2059
Professor Hopper considers the vital role that the study of plant taxonomy and systematics has played in plant science. He considers, in particular, how these fields are transforming to meet the needs of 21st Century science as we address the challen....
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