Table schema:
CREATE TABLE table_11251601_2 (carbon_dioxide_emissions_per_year__10_6_tons___2006_ INTEGER, country VARCHAR)

Question: HOW MANY TONS OF CO2 EMISSIONS DID RUSSIA PRODUCE IN 2006?
SQL: SELECT MAX(carbon_dioxide_emissions_per_year__10_6_tons___2006_) FROM table_11251601_2 WHERE country = "Russia"