Berlin (AP) - Chancellor Angela Merkel is to make the emission of greenhouse gases more expensive - but sees plans for higher energy taxes but skeptical. In the debate on a CO2 price for more climate protection Merkel expressed sympathy for the model of emissions trading. This has the advantage that one can control the amount of "vouchers" and thus also the amount of greenhouse gases emitted, said Merkel at a readers' forum of the "Baltic newspaper". Therefore, she thinks that "from the theory" such a trade better than a price increase over taxes.