CARTA - Anthropogeny (Audio)

As humans have evolved, so has our ability to drastically alter the planet we call home. In this collection of talks from the CARTA symposium, "Humans: The Planet-Altering Apes" you will learn about specific examples on how humans have changed Earth and what can be done to prevent its cataclysmic demise. Walter Willett will discuss how climate change is having devastating effects that will undermine our ability to feed the world’s growing population. Jessica Thompson talks about humans transformed the environment and the damage it has done to our ecosystem. Finally, David Tilman addresses the global alteration of Earth's nitrogen cycle, and what it means for u as a species moving forward. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 38205]

This CARTA public symposia addresses specific examples of how humans have drastically altered the planet. Acknowledged experts discuss clearly defined global-scale negative impacts on planet earth, our life support system (other than climate change, population growth and infectious diseases, which are well-known). Each talk succinctly describes a specific impact, the role that our species has played, and concludes with ongoing or potential approaches to mitigation. In the process, we come full circle to Anthropogeny, asking how a single species could have evolved the ability to so drastically alter the entire planet. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 38009]

Through the Earth Microbiome Program and complementary efforts, we have sampled a broad range of microbiomes from across the planet. All microbiomes that have been studied are impacted by human activity — the effects of industrialization on the human microbiome are best characterized, but capture of animals in zoos, domestication, modification of soils through agricultural practices, and modification of freshwater and marine microbiomes have also all been well characterized. Indeed, the pervasive role of environmental microbiomes in biogeochemical cycles necessary to sustain life led to a position paper entitled "Scientists’ warning to humanity: microorganisms and climate change”, the title of which speaks for itself. However, there is hope. Efforts such as the Microbiota Vault will be especially important in this respect, but also new monitoring and modeling approaches will help us understand where to look globally for the best specimens and microbes to preserve. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37909]

In 1957, the USSR launched Sputnik 1, the first human object to leave Earth. In the 65 years since then the region of Earth orbit has become filled with satellites and space junk. The proliferation of debris has led to the prediction of Kessler Syndrome, a state where a never-ending cascade of collisions between orbital objects renders parts of space unusable for human purposes. However, there are many different ways to look at the space junk surrounding Earth. For example, it is also an archaeological record of humanity’s first steps into outer space, a cultural landscape created by the combined effects of natural and cultural processes, and a technological signature of the same kind that SETI (Search for Extraterrestrial Intelligence) researchers are looking for around exoplanets in other solar systems. It’s unclear when or whether the tipping point into Kessler Syndrome might be reached, but if humanity is confined to Earth in the future, what will this mean? Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37913]

We are experiencing an accelerated rate of loss of species due to human activities. This anthropogenic phenomenon extends beyond extinction. It encompasses an expanded loss of biodiversity as the genetic diversity of species diminish, reducing gene pools to “gene puddles.” We know details of species extinctions events from the fossil record, historical record, and from ancient DNA studies, and that historical processes shape extinction risk. Habitat loss and changing eco-environmental conditions, competition, and other factors produce genomic impacts, also influencing extinction risk. The legacy of past events impacts resiliency of species in the current environment in interpretable ways. Demographic trajectories reveal vulnerability to extinction. Remarkable advances in genomics technologies portend a deeper understanding of the evolution of life and the vulnerability of extant species to changes now taking place through human agency. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37906]

Humans now annually add more biologically available nitrogen to the Earth’s land surfaces than do all natural processes. For 3 billion years, available nitrogen had been the major limiting currency for life on Earth. The recent human disruption of the global nitrogen cycle is causing major environmental harm, including water and air pollution, marine dead zones, 10% of global greenhouse gas emissions, and species extinctions. Three major ways to solve this nitrogen problem are: (1) much more efficient global use of nitrogen fertilizers; (2) shifts to lower-meat and healthier diets; and (3) halting the conversion of food crops into biofuels, such as US corn ethanol used for transport. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37910]

We are losing species much more rapidly now than in the last two million years! At this pace, we may lose a large proportion of vertebrates, including mammals, birds, reptiles, amphibians, and fishes, in the next two to three decades. Modern extinctions caused by human activities are higher than the normal or natural extinction rate which tells us that we may be causing a mass extinction. In the history of life on Earth, there have been five mass extinctions – episodes where large numbers of species became extinct in a short period of time. All mass extinctions have been caused by natural catastrophes, such as the impact of a meteorite. We are the only species that has the capability to save all endangered animals. Paradoxically, saving them is the only way to save humanity. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37904]

The introduction of species into new environments has occurred throughout human history. While most introductions fail and most of those few that establish remain environmentally innocuous, a notable minority wildly proliferates in their new ranges. These invaders disrupt ecosystems and burden economies. Environmental impacts associated with invasions are hard to predict and vary in space and time but include ecosystem-level disruptions, species extinctions, and the homogenization of biodiversity. Economic costs, while challenging to quantify, are enormous and growing. Given that established invaders are difficult to eradicate, let alone manage, stopping invasions before they start remains the most effective strategy to limit further costs resulting from invasions. Challenges to implementing this approach include regulating trade and coordinating rapid governmental responses to emerging threats. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37905]

This CARTA public symposia addresses specific examples of how humans have drastically altered the planet. Acknowledged experts will discuss clearly defined global-scale negative impacts on planet earth, our life support system (other than climate change, population growth and infectious diseases, which are well-known). Each talk succinctly describes a specific impact, the role that our species has played, and concludes with ongoing or potential approaches to mitigation. In the process, we are coming full circle to Anthropogeny, asking how a single species could evolve the ability to so drastically alter the entire planet. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 38008]

Beginning with Homo erectus at least a million years ago, hominins have used fire to engineer the world around them. The earliest uses of fire surely included cooking, changing the energy yields of foods. Such innovations altered the course of our evolution, facilitating the evolution of species that could adapt quickly using tools and social ingenuity. Within the last 200,000 years, hominins also used fire to change the material properties of stone, pigments, sap, and wood. While these changes represent a fundamental shift in the role of humans as dominant shapers of their environments through years of evolution and innovation, ecosystems adjusted as early humans remained embedded within them. However, humans are not now simply shifting to another sustainable balance - we are pushing environmental thresholds across one tipping point after the next. Series: "CARTA - Center for Academic Research and Training in Anthropogeny" [Humanities] [Science] [Show ID: 37907]