“The most significant effect of an impact into the ocean is the injection of water vapor into the stratosphere, with possible climate effects” Gisler said. Indeed, Gisler’s simulations show that large (250 meter-across) rock coming in very hot could vaporize up to 250 metric megatons of water. Lofted into the troposphere, that water vapor would rain out fairly quickly. But water vapor that makes it all the way up to the stratosphere can stay there for a while. And because it’s a potent greenhouse gas, this could have a major effect on our climate.
Accidents Happen was originally intended to be filmed in Connecticut, where it is set, but production remained in Australia, where the script had been written, because finances were easier to raise than in the United States.   Filming was slated to begin in April 2008  but was delayed until June.  Lancaster said that he did "a huge amount of technical preparation" before filming began so that, on the set, he could focus his directing on the actors' performances since the cast was largely inexperienced.  Principal photography commenced in early June with scenes shot on a built set at Sydney's Fox Studios .  Most filming took place in and around Kuringgai , first on Gillian Parade in West Pymble for a week in late June and then Lincoln St, St Ives for 1–2 July.   Lincoln St residents complained about possible disruptions to Ku-ring-gai Council , starting a petition to have production moved elsewhere, and threatening to play bagpipes and wave lights around during filming if it went on as planned.  The council then offered a revised filming schedule, cutting filming down by two days and bringing each day's finishing time forward by an hour to am, and the producers offered some residents a $500 payment to cover any inconveniences.  Filming of the story's integral car crash scene was relocated to another street after the discord.