She hesitated to lower the helmet over her face. This would be her last opportunity for a while to breathe the fresh air of New Earth. The scientist in her was at odds with a deeper layer, common to all human races, that wanted to see beauty and purpose in the "natural" world. She knew perfectly well what Doc—or just about any other Ivyn—would say to her, if he could read her mind. The water in that lake below you is there because we crashed comet cores into the dead Earth until it stayed wet. The air you’re breathing was manufactured by organisms we genetically engineered and sprayed all over the wet planet, then killed once they had accomplished their task. And the sharp scent you like so much comes from vegetation that, for many years, existed only as a string of binary digits stored on a thumb drive on a string around the neck of your Eve.