. >> the long-term agagoal is to provide a baseline data set so that we have some way of tracking future ocean acidification. >> so, do you think these researchers are hopeful that it's going to move in a better way pretty soon? >> it depends upon which researcher you talk to. some are a little bit concerned because, realize, the ocean has been absorbing this pollution for 100 years. and the worst of it is yet to come in some eyes. but other researchers think that we have a pretty good shot if we start changing our ways. >> thank you guys for bringing us another set of incredible stories about invasion here on "techknow." check out more next time. >>dive deep into these stories and go behind the scenes at aljazeera.com/techknow. follow our experts on twitter, facebook, google+ and more. >> good to have you with us. this is al jazeera america. we'll get you caught up with the top stories at this hour. what remains of a 12-story building in gaza hit by airstrikes. israeli claims that hamas was operating out of it. in tonight's special segment we take a deeper look at the islamic state figh