Saying we are loosing energy and we don't know where it goes, this is wrong for a few reasons:

1) Energy is not "lost".
2) Energy dissipates from ordered states to disordered states. That is, heat, random particle motion, aka entropy.
3) The universe as a whole is a closed system, therefore the entropy of the universe is tending upwards.

Nothing is being "lost" here, except for the nebulous quantity - "information". And I should say that even the conjecture that information can be "lost" is highly debatable.

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1984 300D Turbo, 326000 Km, Thistle Green Metallic