The clean tech revolution

Wind power is emerging as a significant force in the global energy market, primarily dominated by large utility companies capable of managing extensive wind farms. These companies are driving the industry's growth, with substantial investments flowing into the sector, providing a robust market for turbine manufacturers.

In 2006, the United States alone generated 11.6 GW of electricity from wind, enough to power approximately 2.9 million homes. The technology behind wind turbines has also advanced, with modern turbines producing about 2 MW each, sufficient to supply around 1,500 American homes. Further technological improvements, potentially through nanotechnology, could enhance turbine efficiency and durability, reducing the cost of wind-generated electricity.

Biofuels are increasingly becoming a significant part of the global economy, transitioning from a fossil fuel-based system to one that relies on plant crops. Ethanol is leading this shift, with biodiesel and bioplastics also gaining traction. The challenge now is to reduce biofuel costs, align demand with feedstock supply, and establish an efficient distribution network. This will require breakthroughs in biotechnology.

The surge in ethanol demand has already impacted corn prices, affecting other economic sectors. Identifying new biofuel crops and ensuring sufficient agricultural land for their cultivation is crucial. Many see corn-derived ethanol as a temporary solution, with cellulosic ethanol, produced from agricultural waste, as a more sustainable option. This could significantly reduce U.S. oil consumption.

Today's commercial and residential green buildings are designed to consume at least 30% less energy than traditional structures. They offer spaces that are brighter, healthier, and more visually appealing to occupants. This efficiency has caught the attention of entrepreneurs, corporate investors, and forward-thinking business leaders.

The most cost-effective and environmentally friendly kilowatt of electricity is the one that is never used. By incorporating efficient technologies from the outset, green buildings benefit everyone involved. These structures harmonize with the natural environment, maximizing the use of sunlight, air, and water to reduce ongoing energy needs. They also utilize construction materials with minimal environmental impact.

Energy efficiency in building construction may not always grab headlines, but it is increasingly recognized as a valuable energy resource. Green buildings are designed for energy efficiency and, with the integration of power generation technologies, can sometimes produce more energy than they consume.

Annually, the world sees the production of 65 million new vehicles, and enhancing their fuel efficiency presents a significant opportunity for energy savings. Automakers are thus focused on developing ultra-efficient vehicles through two primary approaches. The first involves improving the fuel efficiency of traditional internal combustion engine vehicles by reducing their weight, incorporating smarter technologies, or using alternative materials like carbon fiber.

The second approach shifts focus to alternative power sources, including electric engines powered by batteries or hydrogen fuel cells, and the exploration of biofuels. In the realm of electric power, there are four key vehicle designs: hybrids, which combine gasoline and electric engines; plug-in hybrids that charge from household outlets and run on battery power; fully electric vehicles that operate solely on battery power; and fuel-cell vehicles that generate electricity from hydrogen to power electric engines. Among these, hybrids have already achieved mainstream success, while fuel-cell vehicles remain a promising yet uncertain technology.

The traditional power distribution grid, designed for large centralized generators, is evolving into a smarter, more distributed system to accommodate generators of all sizes, including small-scale home wind turbines. This future grid will resemble the Internet more closely, with self-organizing capabilities and two-way communication. It will interact with smart appliances that adjust power usage to balance peak loads, home-based power modules like solar panels that feed excess energy into the grid, building-based energy storage devices for backup power, and advanced fuel-cell systems that both supply and draw energy from the grid.

In the modern era, mobility has emerged as a crucial aspect of daily life, with consumers desiring the ability to use a wide range of devices such as iPods, laptops, cell phones, and personal digital assistants on the go. This demand has led to significant advancements in portable power technologies, including batteries, which are being developed to be less toxic and more efficient.

Beyond batteries, there are exciting developments in portable power technologies that are capturing attention from a clean tech perspective. These include ultracapacitors, which can store large amounts of energy and recharge quickly, and portable fuel cells that generate power on-demand from fuels like ethanol. However, fuel cells face restrictions, such as not being allowed on commercial flights.

The World Health Organization reports that 2 million people die annually due to inadequate water for drinking, sanitation, and hygiene.

The water industry, including clean water provision, is booming and is expected to grow as water becomes more valuable than oil in many regions. To obtain clean water, current technologies include desalination, which uses reverse-osmosis to remove salt from seawater; purification, which involves filtering out impurities, with nanotechnology playing a significant role in developing efficient filters; and wastewater reuse, where sewage is treated for safe drinking water and agricultural use, as seen in Israel.

The water filtration sector was valued at $400 billion in 2006, with future growth anticipated. The industry faces challenges such as reducing leakage in distribution systems, which can reach 30% in developed countries, and developing new filtration methods, possibly using ultraviolet light. Emerging nanotechnology is also expected to enhance filtration and desalination membranes. Additionally, there is potential in building water processing plants powered by renewable energy, extracting water from air, and applying smart metering technologies from the power industry to water management.