A recent study published by an advocacy group finds that imposing a modest tax on top earners can generate hundreds of millions of dollars in much needed revenue for countries in the Caucasus and Central Asia. The added revenue could go a long way in addressing social and economic challenges connected with global warming and climate change, the study adds. The working paper, titled Taxing extreme wealth: What countries around the world could gain from progressive wealth taxes, contends that a comparatively small tax paid by the top 0.5 percent of income earners in every country around the glob…