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Blue whales, the biggest creatures inside the history of our planet, are sustained by tiny krill. Perhaps the Earth's bottomless appetite for fossil fuels might be satiated by something even smaller. Algae tend to be more than just the scum in addition to water-feature. When properly utilized, algae can produce fuels, chemicals and materials which are better and cleaner than petroleum-based ones.
The concrete (usually with steel bar) is poured directly into the stable and solid roadbed, and the new line of ordinary sleeper and gravel bed is not used. This kind of line is clean, suitable for large volume and difficult maintenance area, especially for tunnel, underground railway, port wharf and stone road base. But its construction investment is big, if because of the construction slapdash or basement instability, concrete layer fracture, cure difficulty. China's overall Taoist route in the tunnel is more than 300 kilometers long
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