LNG Exports

This would primarily be a transfer from gas producers to U.S. industries and consumers. Welfare losses would probably be second order.

Restrictions are bad. But they may not turn out to be very important as shale gas extraction technologies disseminate internationally.
-see background information here

Adverse is a weird word, but should allow.

This sort of restriction distorts prices and allocations from their efficient levels. I see no efficiency offsetting gain.

My answer presumes the typical narrow views of what constitutes an adverse effect on the economy.

If U.S. has market power in the energy market, there could be favorable terms of trade effects, but this is likely to be second order.

true. But ppl should understand that a world mkt for LNG means erasing the US's benefit from having lower energy Ps than others

might limit US access to forgn natural resources (e.g.,what about Chinese rare earth materials?). Interesting analysis below
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Totally basic economics--gains from trade

Energy prices are set by world mkt.Restrictions are thus difficult to justify except for national security & especial fragile local environm

Restrictions on free trade seldom benefit the US, and I see no special facts here to make this an exception.

Yes, but export opportunities may be short-lived.
-see background information here

Not highly informed on this topic. NERA report for US gov't says LNG exports would have positive impact on GDP, no effect on employment.
-see background information here

Overall gains but unclear impact on distribution of income.

Presumption should favor free trade.