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<p>currently having a concentration at <a href="page.php?w=sea_level">sea level</a> of 0.5&nbsp;<a href="page.php?w=parts_per_billion">ppb</a>. Global ethane quantities have varied over time, likely due to <a href="page.php?w=Gas_flare">flaring</a> at <a href="page.php?w=natural_gas_field">natural gas field</a>s. Global ethane emission rates declined from 1984 to 2010, though increased <a href="page.php?w=shale_gas">shale gas</a> production at the <a href="page.php?w=Bakken_formation">Bakken formation</a> in the U.S. has arrested the decline by</p><p>
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