Need Help with Data for Regression

#1
Hi,
I am working on a replication of a research paper where I have to compile my own data to copy the regression done in the research paper.
I have never done a regression like this before and I am not sure about the data I chose - I would appreciate any help and input.

All the variables I need:
CO2: CO2 emissions (metric tons per capita) - dependent variable
Population: Population (in millions)
GDP: Real GDP at constant 2011 national prices (in mil. 2011 US$)
K/L: Capital Abundance (Capital stock at constant 2011 national prices (in mil. 2011US$) divided by Number of persons engaged (in millions)) - data by World Penn Tables
Trade Intensity: Exports of Goods and Services (% of GDP) + Imports of Goods and Services (% of GDP)
I: Lagged per capita Income (GNI constant 2010 US$*)

I'm especially unsure about GDP, K/L or Capital Abundance and per capita Income. Do these make any sense? Should I change something?