Question 1

What is the current CO2 level today?

Accepted Answer

Atmospheric CO2 is currently 426.25 ppm, significantly above the pre-industrial level of about 280 ppm. Carbon dioxide (CO2) is a greenhouse gas that traps heat in Earth's atmosphere. The Mauna Loa record is one of the clearest long-running measurements of atmospheric CO2. Before large-scale fossil fuel use, CO2 was about 280 ppm. Today's level is much higher because human activities add CO2 faster than natural sinks can remove it. This rise strengthens the greenhouse effect and is a central driver of modern global warming.

Question 2

What is the current global temperature anomaly?

Accepted Answer

The latest global temperature anomaly in this dataset is 1.99 deg C, showing a warmer climate than the historical baseline. A temperature anomaly measures how much warmer or cooler a year is compared with a reference period. Scientists use anomalies because they make long-term climate change easier to compare across regions and time. NASA GISTEMP combines many observations into a global temperature record. Short-term variability still happens from year to year, but the long-term pattern is clear: recent decades are much warmer than the early record.

Question 3

How much has Earth warmed since 1850?

Accepted Answer

The latest anomaly in this record is 1.99 deg C. It shows substantial warming since the early industrial climate, although this local dataset starts in 1880 rather than 1850. Climate warming since 1850 is usually measured against the 1850-1900 early industrial reference period. This page uses the NASA GISTEMP annual anomaly record available in the project, which begins in 1880. The exact number depends on the dataset and baseline, but the direction is not ambiguous: the modern climate is much warmer than the late 19th century. The warming comes mainly from greenhouse gases added by human activity.

Question 4

How do CO2 levels today compare with the pre-industrial era?

Accepted Answer

CO2 is now about 146.3 ppm above the pre-industrial level, or roughly 1.52 times higher. The pre-industrial atmosphere contained about 280 ppm of CO2. That level was relatively stable for thousands of years before industrialization. Since the 19th century, burning coal, oil and gas, plus land-use changes, have increased atmospheric CO2 sharply. The difference between today and the pre-industrial era matters because CO2 persists in the atmosphere and continues to influence temperature, oceans and ecosystems.

Question 5

Which countries emit the most CO2 today?

Accepted Answer

The latest country emissions dataset totals about 37,405.4 MtCO2, with the largest emitters concentrated among major industrial and populous economies. Country CO2 emissions usually describe territorial fossil fuel and industry emissions released within national borders. They are different from atmospheric CO2 concentration, which measures how much CO2 is already mixed into the air. Country rankings help explain where current emissions come from, but they do not by themselves show historical responsibility, consumption-based emissions or per-person emissions. Those views are useful complements when comparing countries.

Short answers to common climate data questions

Temperature

What is the current global temperature anomaly?

How much has Earth warmed since 1850?

CO2 and Emissions

What is the current CO2 level today?

How do CO2 levels today compare with the pre-industrial era?

Which countries emit the most CO2 today?