Where can I find facts on the impact to providing contraceptives?

The EA literature is missing an elevator-pitch.
As a first approximation, Id suggest:

EA is a diligent approach to charity and ethical goals

Typical interests:

• Global poverty
• Animal suffering
• Existential risks
• Earning to give

Characteristics:

• Focuses on consequences
• Maximises the good done per unit of time/money
• Impartial to location and future generations
• Attentive to opportunity costs
• Often measures benefits
• ITN framework:
— Importance eg number of lives saved, amount of suffering decreased
— Tractability: additional resources will greatly address the issue
— Neglectedness: few other people are working on the problem

https://kungfuhobbit.medium.com/effective-altruism-64ec03b00636