Question: What country with co2 emissions per capita once of 2009 metric ton did Maria Theresa rule?
Answer(s):
answer: Hungary

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0czh6)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0czh6 ns:royalty.monarch.kingdom ?x .
?x ns:location.statistical_region.co2_emissions_per_capita ?c .
?c ns:measurement_unit.dated_metric_ton.date "2009"^^xsd:dateTime . 
}