It is soluble in acetone, ethanol, ethyl ether, aromatic solvents and halocarbons. There are several thousand complex halocarbons known, produced mainly by marine species. Contact with halocarbons may cause a violent reaction. Both types of ozone depletion were observed to increase as emissions of halocarbons increased. Many halocarbons have specialized uses in industry. Like many other liquid halocarbons, 1-bromopropane finds use as a liquid or gaseous solvent. He also spent time in Pisa, working on halocarbons. A few halocarbons are produced in massive amounts by microorganisms. Like other related halocarbons, it is a potentially dangerous alkylating agent. In-kind gaseous agents generally fall into two further categories, halocarbons and inert gases. Aside from purely human-produced synthetic halocarbons, most greenhouse gases have both natural and human-caused sources. Exotic trace compounds include mercury, halocarbons (including CFCs), and halogen oxide radicals. The first synthesis of halocarbons was achieved in the early 1800s. Possible alternative fuels are e.g. nitrotoluene, gasoline, nitromethane, or halocarbons. Like other chloroacetic acids and related halocarbons, chloroacetic acid is a hazardous alkylating agent.