Photo by Maxim Tolchinskiy on Unsplash
Greenhouse gas emissions attributable to products—from food to sneakers to appliances—make up more than 75% of global emissions. -The Carbon Catalogue
Our data, which is publicly availably on nature.com, contains product carbon footprints (PCFs) for various companies. PCFs are the greenhouse gas emissions attributable to a given product, measured in CO2 (carbon dioxide equivalent).
This data is stored in a PostgreSQL database containing one table, prouduct_emissions, which looks at PCFs by product as well as the stage of production these emissions occured in. Here's a snapshot of what product_emissions contains in each column:
product_emissions
product_emissions| field | data_type |
|---|---|
| id | VARCHAR |
| year | INT |
| product_name | VARCHAR |
| company | VARCHAR |
| country | VARCHAR |
| industry_group | VARCHAR |
| weight_kg | NUMERIC |
| carbon_footprint_pcf | NUMERIC |
| upstream_percent_total_pcf | VARCHAR |
| operations_percent_total_pcf | VARCHAR |
| downstream_percent_total_pcf | VARCHAR |
You'll use this data to examine the carbon footprint of each industry in the dataset!
You are interested in the recent carbon emissions of each industry in product_emissions.
Write a query which returns a table of each industry_group along with the number of companies which are in that industry and a total of the PCFs for that industry, rounded to the neared tenth. Please name the three columns industry_group, count_industry, and total_industry_footprint.
product_emissions contains data for several years, but your results should only include data for the most recent year that data was collected. Finally, your results should be presented in order from the highest emitting industries to the lowest emitting industries.
-- Find most recent year in dataset
SELECT MAX(year) as "recent_year"
FROM product_emissions;-- Start coding here...
SELECT industry_group,
COUNT(company) as count_industry,
round(SUM(carbon_footprint_pcf), 1) as total_industry_footprint
FROM product_emissions
WHERE year = 2017
GROUP BY industry_group
ORDER BY total_industry_footprint DESC;