def calculate_co2_emissions(fuel_consumptions, fuel_carbon_content):
    """
    Calculates instantaneous CO2 emission vector [CO2g/s].

    :param fuel_consumptions:
        The instantaneous fuel consumption vector [g/s].
    :type fuel_consumptions: numpy.array

    :param fuel_carbon_content:
        Fuel carbon content [CO2g/g].
    :type fuel_carbon_content: float

    :return:
        CO2 instantaneous emissions vector [CO2g/s].
    :rtype: numpy.array
    """
    return fuel_consumptions * fuel_carbon_content
