But we know that it was us that scorched the sky.

6 seconds sound clip from the The Matrix movie soundboard.

You can hear this line at 00:41:50 in the Blu-ray version of the movie.

Quote context

[...]

- But what we know for certain is that at some point in the early 21st century all of mankind was united in celebration.

- We marveled at our own magnificence as we gave birth to AI.

- AI... You mean artificial intelligence.

- A singular consciousness that spawned an entire race of machines.

- We don't know who struck first, us or them.

- But we know that it was us that scorched the sky.

- At the time they were dependent on solar power and it was believed that they would be unable to survive without an energy source as abundant as the sun.

- Throughout human history, we have been dependent on machines to survive.

- Fate, it seems, is not without a sense of irony.

- The human body generates more bio-electricity than a 120-volt battery. And over 25000 BTUs of body heat.

[...]