Now litigators have yet another target in their sights: those responsible for climate change. Two cases have already been launched in the US courts. More are in the pipeline, according to the newly formed Climate Justice Programme...It believes that international and domestic laws - covering human rights, product liability, public nuisance, pollution and harm to other states - will be an effective weapon in forcing emission cuts and make perpetrators liable for the consequences of their actions...But litigators will need to overcome serious obstacles if climate change-related damage is to become the subject of billion-dollar lawsuits...Potential defendants could be fossil fuel companies, electric utilities and car manufacturers...Companies that delay taking action on climate change are also at risk of being sued by their investors.