The G20 meetings in Toronto will be marked by competing agendas on global growth and financial regulations. This Backgrounder looks at the range of policy concerns.

China’s anti-satellite test in January drew international condemnation but also piqued interest in some quarters about instituting a space weapons ban.

G8 members offer a mixed picture on meeting Kyoto Protocol targets. The United States continues to refuse ratification.

President Barack Obama says he will seek vigorous climate-change policy. Efforts to curb greenhouse gases pose considerable economic pitfalls, as well as opportunities.