Feature Request: Cost to offset

In addition to knowing how much carbon a computation emits, it can also be insightful and more importantly actionable to know how much it would cost to offset that emission. I have a small demo script that uses the rates reported by two services: terrapass and cotap.

"""
Requirements:
    pip install codecarbon pint
"""

# Use pint for easy unit conversion
import pint
from codecarbon import EmissionsTracker
reg = pint.UnitRegistry()
reg.define('CO2 = []')
reg.define('dollar = []')
CO2_ton = reg.CO2 * reg.metric_ton
CO2_kg = reg.CO2 * reg.kg
CO2_pound = reg.CO2 * reg.pound


# ====================
# Carbon tracking code
# ====================
tracker = EmissionsTracker()
tracker.start()

# GPU Intensive code goes here
for i in range(100):
    pass

# tracker returns CO2 emissions in kgs
emissions = tracker.stop() * CO2_kg

# Pretend that we did a lot more than we did
pretend_factor = 1000000000
compute_emissions = emissions * pretend_factor

# ========================================
# That's all there is too carbon tracking!
# ========================================

# Calculate cost to offset with one of these carbon capture services:
co2_offset_costs = {
    'terrapass': (100.75 * reg.dollars) / (20_191 * CO2_pound).to(CO2_ton),
    'cotap': (15 * reg.dollars) / (1 * CO2_ton),
}
service = 'cotap'  # cotap is non-profit, lets use them
dollar_per_co2ton = co2_offset_costs[service]

cost_to_offset = (compute_emissions * dollar_per_co2ton).to_base_units()
print(f'It will cost roughly ${cost_to_offset:.2f} to offset this emission')

I think gathering information on available carbon offsetting services and increasing awareness of them would be a great direction for this project.

Start with the supplied Python demo and its EmissionsTracker usage, then review how the terrapass and cotap rates are gathered and represented. Define what offset-service information the project should expose and how the cost calculation should be verified; done means the feature has a clear supported scope beyond the demo.