How can I use the Internet (Web 2.0) to communicate and problem-solve global issues that are impacting our world today to a wider audience? 

We can post videos to save the world  the global issues. We can also make websites and try to persuade the people and show  the consequences of global issues.

How can the Internet be used to help a community solve an environmental issue? (give some specific examples) Look at the References below (See References.

We can help community service by  putting advirtismets for event happening or you can put donation site.