Text: when the sun is shining and you need to cool down the tempting lake is just a short walk away with its fresh and clean water to swim in.

Correct capitalization: When the sun is shining and you need to cool down the tempting lake is just a short walk away with its fresh and clean water to swim in.

Text: with many translators setting minimum prices for translations, having an email translated can be expensive and time consuming.

Correct capitalization: With many translators setting minimum prices for translations, having an email translated can be expensive and time consuming.

Text: transport from the airport of barcelona we have caught a taxi and were around 30.

Correct capitalization: Transport from the airport of Barcelona we have caught a taxi and were around 30.

Text: it is because of the solar energy that there is life on earth. without the heat from the sun, the earth would be a cold place and it is solar energy that drives photosynthesis.

Correct capitalization:
It is because of the solar energy that there is life on Earth. Without the heat from the sun, the earth would be a cold place and it is solar energy that drives photosynthesis.