Table: gdp_co2_emissions_chad
Columns: country
annual_co2_emissions_in_thousands_of_metric_tons
gdp_current_in_billions_of_us_dollars
gdp_per_emissions_in_us_dollars_per_ton
gdp_ppp_in_billions_of_current_international_dollars
ppp_gdp_per_emissions_in_international_dollars_per_ton

Question: When the gdp (ppp, in billions of current international dollars) is 7.93, what is the maximum ppp gdp per emissions (in international dollars per ton)?
SQL: SELECT MAX("ppp_gdp_per_emissions_in_international_dollars_per_ton") FROM gdp_co2_emissions_chad WHERE "gdp_ppp_in_billions_of_current_international_dollars" = '7.93'

Question: when the gdp per emissions (in us dollars per ton) is 3903, what is the maximum annual co2 emissions (in thousands of metric tons)?
SQL: SELECT MAX("annual_co2_emissions_in_thousands_of_metric_tons") FROM gdp_co2_emissions_chad WHERE "gdp_per_emissions_in_us_dollars_per_ton" = 3903

Question: when the annual co2 emissions (in thousands of metric tons) is 1811, what is the country?
SQL: SELECT "country" FROM gdp_co2_emissions_chad WHERE "annual_co2_emissions_in_thousands_of_metric_tons" = 1811

Question: when the gdp (current, in billions of us dollars) is 162.50, what is the GDP?
SQL: SELECT MAX("gdp_per_emissions_in_us_dollars_per_ton") FROM gdp_co2_emissions_chad WHERE "gdp_current_in_billions_of_us_dollars" = '162.50'