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In the last video we learned a little bit about photosynthesis

For this essay’s purposes, the most important ecological understanding is that the Sun provides all of earthly life’s energy, either (all except nuclear-powered electric lights driving photosynthesis in greenhouses, as that energy came from dead stars). Today’s hydrocarbon energy that powers our industrial world comes from captured sunlight. Exciting electrons with photon energy, then stripping off electrons and protons and using their electric potential to power biochemical reactions, is what makes Earth’s ecosystems possible. Too little energy, and reactions will not happen (such as ice ages, enzyme poisoning, the darkness of night, food shortages, and lack of key nutrients that support biological reactions), and too much (such as , ionizing radiation, temperatures too high for enzyme activity), and life is damaged or destroyed. The journey of life on Earth has primarily been about adapting to varying energy conditions and finding levels where life can survive. For the many hypotheses about those ancient events and what really happened, the answers are always primarily in energy terms, such as how it was obtained, how it was preserved, and how it was used. For life scientists, that is always the framework, and they devote themselves to discovering how the energy game was played.

To answer those questions, we first have to understand what leaves are and what they do

On numerous fronts, humanity is staring into the abyss, primarily due to our energy practices. The USA's and may be seen by future historians, if there are any, as the , as humanity fights over Earth's last remaining high-EROI energy resources. One of Einstein’s was, “I do not know with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.” Maybe some of us survive that holocaust and the . Maybe we will avoid fighting over hydrocarbons, but the oceans will rise as climate changes more dramatically and billions are displaced. That will trigger global famine and a different kind of World War III, as nations fight over food (and maybe water), not oil. can drive people to drink and worse. Humanity stands on the chasm’s edge today, and hardly any people know or care, as their immediate self-interest marks the limit of their awareness. It has always been this way, when people are just trying to survive and deaden the pain of their existences. The intense denial reactions that Brian encountered when he played the were standard.

Energy Resources - Tulane University

The electrons go through a transport chain which amounts to a kind of respiration in the middle of photosynthesis, in other words the energetically favorable transfer from -0.8 V to +0.4 V drives the synthesis of some ATP.

Energy and the Human Journey: Where We Have Been; …

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