How many years of comparable data are there for Hong Kong and Romania?

38 years are reported by both, from 1987 to 2024.

Where does this data come from?

Statizoid (derived), published as Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per unit of GDP. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Hong Kong vs Romania: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per unit

Hong Kong

0 Mt CO2e per US$ of GDP

in 2024

Romania

0 Mt CO2e per US$ of GDP

in 2024

Hong Kong rank

173rd

Romania rank

172nd

Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per unit over time

Hong Kong
Romania

How they compare

Romania currently reports 0 Mt CO2e per US$ of GDP against 0 Mt CO2e per US$ of GDP in Hong Kong, a difference of 0 Mt CO2e per US$ of GDP.

Across all 38 years both countries report, Romania has been ahead every year.

Hong Kong ranks 173rd and Romania ranks 172nd of 191 countries.

Romania has averaged higher in every one of the 5 decades both report.

Head to head by decade

Decade	Hong Kong	Romania	Difference	Ahead
1980s	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	Romania
1990s	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	Romania
2000s	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	Romania
2010s	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	Romania
2020s	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	0 Mt CO2e per US$ of GDP	Romania

Averages of every year both report within each decade.

Frequently asked questions

Which has higher methane (ch4) emissions from transport (energy) (mt co2e), per unit, Hong Kong or Romania?: Romania, at 0 Mt CO2e per US$ of GDP against 0 Mt CO2e per US$ of GDP in Hong Kong as of 2024.
What is the difference in methane (ch4) emissions from transport (energy) (mt co2e), per unit between Hong Kong and Romania?: 0 Mt CO2e per US$ of GDP, with Romania ahead.
How many years of comparable data are there for Hong Kong and Romania?: 38 years are reported by both, from 1987 to 2024.
How do Hong Kong and Romania rank globally for methane (ch4) emissions from transport (energy) (mt co2e), per unit?: Hong Kong ranks 173rd and Romania ranks 172nd of 191 countries.
Where does this data come from?: Statizoid (derived), published as Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per unit of GDP. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Hong Kong vs Romania: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per unit. Statizoid, drawing on Statizoid (derived). Retrieved 21 September 2026, from https://environment.statizoid.com/compare/methane-ch4-emissions-from-transport-energy-mt-co2e-per-unit-of-gdp/hong-kong-sar-china/romania/

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About this data

Indicator: Methane (CH4) emissions from Transport (Energy) (Mt CO2e), per unit of GDP
Unit: Mt CO2e per US$ of GDP
Source: Statizoid (derived)
Licence: Derived by Statizoid from the sources named on the page
Coverage: 238 places, 12,139 data points, 1970–2024
Last refreshed: 21 September 2026

Methane (CH4) emissions from Transport (Energy) (Mt CO2e) divided by GDP (current US$), matched on country and year. Neither publisher issues this ratio as a series; it is computed here from both.