Globally existential threats due to ‘overpopulation momentum’ together with the top-heavy age structure leave by now no alternative to radical technological adaptation for anything that wants to survive 'long term'.  It is strictly too late to ‘go green’ except via a novel take on what constitutes ‘green’, including synthetic biology.  Hyped for a long time, nanoscience is still largely in its pioneering phase.  However, it matures as we speak and soon, as it becomes true nanotechnology, it will leave the hype far behind.

Solar cells act something like leaves, capturing sunlight and turning it into energy - unfortunately the manufacturing of solar cells, unlike trees, is something of an environmental disaster. From rare earth metals to all kinds of other materials due to substrates and cells, solar panels have to function for decades before they break even, as far as any ecological savings are considered.
 
If only solar cells could instead be made from trees.

Georgia Tech and Purdue researchers say they have done it; they have developed efficient solar cells using natural substrates derived from trees. Just as importantly, by fabricating them on cellulose nanocrystal (CNC) substrates, the solar cells can be quickly recycled in water at the end of their life cycle.

Carbon dioxide created by the widespread burning of fossil fuels is the key factor in climate change, so researchers are looking for new ways to generate cleaner power. 

Researchers from the University of Georgia have shown they can take the carbon dioxide trapped in the atmosphere and turn it into industrial products - a roadmap to biofuels made directly from the carbon dioxide in the air. 

Fluctuating wind speed and direction means turbines generate power inconsistently. Coupled with customers' varying power demand, the results is that many wind-farm managers end up wasting power-generation capacity and limiting the service life of turbines through active control, including fully stopping turbines, in order to damage to the power grid from spikes in supply.

The earth has abundant energy sources, if only we would bother to tap them. Wind power has had its financial and ethical ups and downs, with wind farms using gargantuan, expensive wind towers decorating or despoiling the scenery,depending on your esthetics:

Wind power resources on the eastern U.S.continental shelf are estimated to be over 400 GW [gigawatts], several times the electricity used by U.S. eastern coastal states…. The furthest advanced of a handful of proposed U.S. offshore wind developments is in Nantucket Sound,off the Southern coast of Cape Cod, Massachusetts.

Over 200 million years ago, a mass extinction wiped out an estimated 76 percent of marine and terrestrial species. It marked the end of the Triassic period and the onset of the Jurassic, clearing the way for dinosaurs to dominate Earth for the next 135 million years. 

It's not clear what caused the end-Triassic extinction, although most scientists agree on a likely scenario; over a relatively short time period, massive volcanic eruptions from a large region known as the Central Atlantic Magmatic Province (CAMP) spewed forth huge amounts of lava and gas, including carbon dioxide, sulfur and methane. 

An innovative new process releases the energy in coal without burning, while capturing carbon dioxide, the major greenhouse gas that is the target of emissions reduction goals. How close is it to commercial use?  It has passed an important milestone - a successful 200-hour test on a sub-pilot scale version of the technology using two inexpensive but highly polluting forms of coal.   

Mandates and subsidies have created an artificial green energy industry. In the case of ethanol, that has led to escalating corn prices. Higher prices have encouraged some farmers to switch to growing corn continuously and they are seeing unusually high yield reductions.

 A six-year study has identified three key factors affecting yield in continuous corn (CC) systems.

Scientists have found a layer of liquefied molten rock in Earth's mantle that may be acting as a lubricant for the sliding motions of the planet's massive tectonic plates. The discovery was made at the magma layer at the Middle America trench offshore Nicaragua. Using advanced seafloor electromagnetic imaging technology pioneered atScripps Institution of Oceanography at UC San Dieg , the scientists imaged a 16 mile-thick layer of partially melted mantle rock below the edge of the Cocos plate where it moves underneath Central America.