Global change refers to planetary-scale changes in the Earth system.
More completely, the term “global change" encompasses: planetary scale changes to atmospheric circulation, ocean circulation, climate, the carbon cycle, the nitrogen cycle, the water cycle and other cycles, sea-ice changes, sea-level changes, food webs, biological diversity, pollution, health, fish stocks, and more.
Civilization is now a large driver of global change so the term includes population, the economy, resource use, energy, development, transport, communication, land use and land cover, urbanization, globalization.
Some Earth system changes, natural or driven by humans, can have significant consequences without involving changes in climate. Global change should not be confused with climate change; it is significantly more. indeed, climate change is part of this much larger challenge (IGBP, 2020).
Interview with Prof. Hesham El-Askary
49th IAH Congress The International Association of Hydrogeologists
The theme of the 49th IAH Congress is “Groundwater Sustainability and Poverty Reduction”. Poverty reduction is a top priority for most countries in the world. Unfortunately, most of the poor countries and regions have been faced with serious problems of water scarcity and contamination. It is the mission and ultimate responsibility of the international community of hydrogeologists to help the people get access to sustainable safe supply of fresh groundwater.
Prof. of Remote Sensing and Earth Systems Science and Director Computational & Data Sciences Graduate Programs at the Center of Excellence in Earth Systems Modeling & Observations Schmid College of Science and Technology, Chapman University, USA
Prof. El-Askary received his Ph.D. in Computational Sciences and Informatics from George Mason University in 2004 along with his two MS degrees in Computational sciences and Earth Systems Sciences. He is also a Professor of Environmental Physics on leave with the Department of Environmental Sciences, Faculty of Science, Alexandria University, Egypt. Prof. El-Askary was also affiliated with the National Authority of Remote Sensing and Space Sciences (NARSS), Cairo.