The first job is for the environmental assistant and the gas checker to walk through the tunnels monitoring ventilation and air quality.

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The company is gaining share in U.S. hydraulic fracturing markets used to produce natural gas and improving its seismic imaging, monitoring, and development business.

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And the risk of earthquakes, which has long been present in conventional oil-and-gas extraction, is modest and mitigated by monitoring.

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The new "multilateration" monitoring system is a joint initiative by Oil and Gas UK and National Air Traffic Services Ltd (Nats).

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And like integrated oil and gas companies, the efficiency developer is responsible for installing and monitoring the efficiency measures, ensuring that the building upgrades produce savings for years to come.

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The chief greenhouse gas was measured Thursday at 400 parts per million in Hawaii, a monitoring site that sets the world's benchmark.

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