Hundreds groups have joined to oppose G-20 efforts . The Group of Eight plans a summit in graffiti in 1997 . Collectively , the G-20 accounts for about 85 percent of global economic output .
About four dozen groups have joined to oppose G-20 efforts . The Group of 20 plans a summit in Seoul in November . Collectively , the G-20 accounts for about 85 percent of global economic output .