James Paleologopoulos Boston University Statehouse Program BOSTON — A month after Gov. Charlie Baker signed an expansive climate change bill into law, state lawmakers are continuing to push for action on carbon emissions and more, with several highlighted by youth organizers at Beacon Hill during “Earth Week.” Bill S.9, also known as “An Act Creating a Next-Generation Roadmap for Massachusetts Climate Policy,” was signed last month and, among other actions, establishes a timeline for the state to achieve net-zero carbon emissions by 2050. Though happy to see the bill’s passage, high school students from throughout Greater Boston are calling for further action, gathering Thursday in front of the State House to mark Earth Day with chants and speeches.