Obama: Sandy Hook shooting reminds us of big struggles, such as climate change: ‘All of us have to be concerned about a changing climate’
Obama: 'When you think about the last few days, you're reminded that there's a fundamental human response that transcends cultures and transcends borders...At the same time, we're mindful that we've got so much more work to do together...And all of us have to be concerned about a changing climate that could have a profound impact on every single country here'
