Question: In which countries of Central America were the CO2 emissions per capita at one time 2010 metric tons?
Answer(s):
answer: Belize
answer: Costa Rica
answer: El Salvador
answer: Guatemala
answer: Honduras
answer: Panama

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.01tzh)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.01tzh ns:location.location.contains ?x .
?x ns:common.topic.notable_types ns:m.01mp .
?x ns:location.statistical_region.co2_emissions_per_capita ?c .
?c ns:measurement_unit.dated_metric_ton.date "2010"^^xsd:dateTime . 
}