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" ... If dark energy is what it seems, that has some tremendous and profound implications for the future fate of our Universe. Based on its current behavior, we’re tempted by the data to infer that dark energy is a constant: its energy density doesn’t change with time. That means, as the Universe expands and its volume increases, it actually gains energy. (Violating the conservation of energy, yes, but energy is not conserved for the expanding Universe.) ... "
" ... In a light-emitting process like combustion, energy is still conserved. Light and heat is emitted as... [+] a by-product of the combustion reaction, but if we include all the stored chemical energy in the molecular bonds of the wood and the atmosphere's oxygen, we find that energy is conserved between the initial and final states. ... "