We need to celebrate the love for the natural world we still have and not just mourn the tragic and irreversible loss of species. The limpid eyes of an endangered species of charismatic mega-fauna stare pleadingly from the page, accompanied by a suitably dramatic headline: "On the brink" or "Last chance to save". We're all familiar with the imploring, urgent tone of so much of the campaigning communication around nature conservation, where the words biodiversity and extinction are almost automatically conjoined. In fact, they're so inextricably linked that campaigners often seem to find it difficult to mention species without the qualifier, "under threat".
The 4,000 cows at the Ukrainian Milk Company Ltd. near Kiev are doing more than producing dairy products. Their dung is being used to produce energy at the country's first biogas cogeneration plant. The facility, which just completed its ninth month of operation, also is the first in the country to deploy a General Electric Jenbacher gas engine specially designed for cogeneration. Through its operation, the facility substitutes the equivalent of 1.2 million cubic meters of natural gas a year, resulting in the reduction of an estimated equivalent of 18,000 metric tons in CO2 emissions.
Part of the fine print in solar power systems is that whatever wattage number is quoted, it is usually “peak watts,’’ or the amount of electricity that the panel would deliver when the sun is directly overhead. For the rest of the daylight hours, the output is lower; a graph showing minute-by-minute production resembles a sharp mountain peak. One way to do better is to mount the panel on a metal backbone and let it tilt over the course of the day, keeping itself pointed towards the sun from sunrise to sunset. This is called a single-axis tracker. Better yet is a two-axis tracker, which also adjusts the angle to compensate for how high the sun is in the sky. Then the graph showing output would resemble a plateau. But all of this adds cost.
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