Alternative energy, clean tech, and new energy tend to conjure up different definitions — for good reason. The industries and technologies that comprise clean tech are extremely diverse, ranging from jatropha plantations for bio-diesel to advanced battery technologies. In essence, clean tech is composed of industries using newer or cleaner technologies to generate or use energy better — a noble pursuit, given the evidence that our world’s reliance on dirtier fossil fuels is leading to a gradual warming of our planet.