CO2 absorbs some wavelengths of infrared that water does not, so it independently adds heat to the atmosphere. (scientificamerican.com)
But a laser can set up a quantum - mechanical interference that blocks the electrons from making the jump, allowing a second beam at the normally absorbed wavelength to zip through. (sciencemag.org)
When ozone absorbs these wavelengths of UV light, the compound is destroyed. (earthtimes.org)