Tidal energy could be huge – why isn't it?

As the global demand for energy continually increases, the strain on natural resources and the detrimental effects of fossil fuels become more problematic. But new developments in renewable energy technologies may provide new solutions. Minesto, a company based out of Northern Ireland, has a new device - structured something like an underwater kite - that allows for the constant harvesting of tidal power, regardless of current weather or wave conditions.

Hywind Scotland is the world's first commercial wind farm using floating wind turbines to generate power for about 36,000 homes a year. This approach — which is being seriously looked at by several countries seeking to reduce their carbon emissions and oil-and-gas companies wanting to expand into renewable energy — allows wind farms to work in deeper waters where there is often stronger winds.

Since the Philippines relies on boats to transport people and goods across the island nation, a shipbuilding company is designing a new low-carbon alternative of the bangka — a traditional Filipino boat — that uses the waves of the ocean to power it instead of fossil fuels. The ship, known as the trimaran, uses wave energy that converts into electricity for the ship. However, a typhoon and the COVID-19 pandemic have delayed the project, and there are also cost and design challenges. But the trimaran’s use of wave energy could be a step toward reducing the country’s greenhouse gas emissions.

Floating wind turbines off the coast of Portugal is one of the latest experiments to convert wind energy into electric power. These machines can generate electricity for a city of up to 60,000 people. While it will take more financing and time to scale the project, investors are impressed with the results and see it as a viable financial return to combat climate change.

In a campaign to boost community interest in and use of urban wind power, city officials in Reno, Nevada, are helping consumers take the guesswork out of buying home turbines. Through an online consumer guide called the Green Energy Dashboard, potential buyers are able to track power output and durability of different turbines and determine which would be most efficient for their community.

Two organizations partnered to help eight low-income households convert their homes to become all-electric in Virginia. It entailed replacing fossil-fuel based heating and cooling systems like stoves and water coolers with electric ones. Some of the households saw a reduction in their utility bills. Organizers estimate that over the course of 20 years the changes will result in the households avoiding the emission of over 2 million pounds of carbon dioxide.

Enrolling administrators and financial planners in sustainable projects takes proving that investments pay for themselves. With the help of pressure from students and faculty, Penn State Universities administrators have adopted a long-term strategy to reduce the university’s carbon footprint and implement sustainable practices. Students produced the data that illuminated the university’s unsustainable practices; the numbers now show that their efforts are paying off.

This story examines the well-publicized climate-change strategy of carbon credits: the idea that a CO₂-emitting company could offset its emissions by funding anti-logging efforts, effectively "saving" the equivalent amount of carbon. However, as it turns out, despite its popularity, most carbon credit programs do not actually work or, worse, may do more harm than good. This article details the shortcomings of this attempted solution to the effects of global warming.

An economic shift to renewable energy could take decades, but thanks to rapidly evolving disruptive technologies, dropping prices of solar and wind power sources, and increasing market demand for green business, the new age of renewable energy could encompass the world economy much more quickly.

Dams make for complex and often controversial infrastructure. While hydropower generated from large dam projects is currently providing the bulk of the planet's renewable energy, dams can also cause major environmental and social damage by interrupting animal migrations, displacing indigenous communities, and collecting toxins. A number of solutions are being implemented, however, to address the various issues caused by dams, to help make them a more eco-friendly and viable source of clean energy.