As seen in the chart above, the North American countries score very poorly when it comes to all kinds of Greenhouse Gas Emissions. What is the lowest score of any of the three countries on any variable within these aggregate variables (i. e., you will need to drill into Carbon Emissions and Other Greenhouse Gasses for each country to find the lowest score across all variables and countries). United States on CO2 Emissions (KT), score of 78 Canada on CO2 Emissions, Metric Tons per Capita, score of 98 Mexico on CO2 Emissions (KT), score of 389 United States on Black Carbon Emissions, score of 229