The biggest hurdle to come is meeting the legal requirement that specific actions from the defendant, which they knew were negligent, led to specific damages to

The biggest hurdle to come is meeting the legal requirement that specific actions from the defendant, which they knew were negligent, led to specific damages to the city of Baltimore. Those are the three basic requirements to any claim under tort law. The hardest one is proving that these specific companies caused global warming to a sufficient degree that it directly damaged Baltimore. The defense will make obvious counter-arguments - for example that Baltimore itself engaged in the same CO2 emmissions behavior by purchasing oil/gas and facilitating trade of such (and taxing it) within their own jurisdiction. ...and further that many many other companies throughout history have contributed to atmospheric CO2, not just these companies. ...AND that the damage to Baltimore thus far might be considered normal weather variations.